Add screen rotation support (tested on amd/intel)

screen rotation in wayland is best effort,
wayland doesn't give the necessary information to make it robust.

6 files changed, 304 insertions, 53 deletions

diff --git a/src/capture/kms_cuda.c b/src/capture/kms_cuda.c
index f5b96a8..f9a6a11 100644
--- a/src/capture/kms_cuda.c
+++ b/src/capture/kms_cuda.c
@@ -50,6 +50,8 @@ typedef struct {
     unsigned int target_texture;
 
     gsr_color_conversion color_conversion;
+
+    gsr_monitor_rotation monitor_rotation;
 } gsr_capture_kms_cuda;
 
 static int max_int(int a, int b) {
@@ -162,8 +164,16 @@ static int gsr_capture_kms_cuda_start(gsr_capture *cap, AVCodecContext *video_co
         return -1;
     }
 
+    monitor.name = cap_kms->params.display_to_capture;
+    cap_kms->monitor_rotation = drm_monitor_get_display_server_rotation(cap_kms->params.egl, &monitor);
+
     cap_kms->capture_pos = monitor.pos;
-    cap_kms->capture_size = monitor.size;
+    if(cap_kms->monitor_rotation == GSR_MONITOR_ROT_90 || cap_kms->monitor_rotation == GSR_MONITOR_ROT_270) {
+        cap_kms->capture_size.x = monitor.size.y;
+        cap_kms->capture_size.y = monitor.size.x;
+    } else {
+        cap_kms->capture_size = monitor.size;
+    }
 
     video_codec_context->width = max_int(2, cap_kms->capture_size.x & ~1);
     video_codec_context->height = max_int(2, cap_kms->capture_size.y & ~1);
@@ -316,6 +326,16 @@ static bool gsr_capture_kms_cuda_should_stop(gsr_capture *cap, bool *err) {
     return false;
 }
 
+static float monitor_rotation_to_radians(gsr_monitor_rotation rot) {
+    switch(rot) {
+        case GSR_MONITOR_ROT_0:   return 0.0f;
+        case GSR_MONITOR_ROT_90:  return M_PI_2;
+        case GSR_MONITOR_ROT_180: return M_PI;
+        case GSR_MONITOR_ROT_270: return M_PI + M_PI_2;
+    }
+    return 0.0f;
+}
+
 /* Prefer non combined planes */
 static gsr_kms_response_fd* find_drm_by_connector_id(gsr_kms_response *kms_response, uint32_t connector_id) {
     int index_combined = -1;
@@ -381,6 +401,13 @@ static gsr_kms_response_fd* find_cursor_drm(gsr_kms_response *kms_response) {
     return NULL;
 }
 
+static vec2i swap_vec2i(vec2i value) {
+    int tmp = value.x;
+    value.x = value.y;
+    value.y = tmp;
+    return value;
+}
+
 static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
     (void)frame;
     gsr_capture_kms_cuda *cap_kms = cap->priv;
@@ -457,12 +484,40 @@ static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
     if(!capture_is_combined_plane)
         capture_pos = (vec2i){drm_fd->x, drm_fd->y};
 
+    const float texture_rotation = monitor_rotation_to_radians(cap_kms->monitor_rotation);
+
     gsr_color_conversion_draw(&cap_kms->color_conversion, cap_kms->input_texture,
         (vec2i){0, 0}, cap_kms->capture_size,
         capture_pos, cap_kms->capture_size,
-        0.0f, false);
+        texture_rotation, false);
 
     if(cursor_drm_fd) {
+        const vec2i cursor_size = {cursor_drm_fd->width, cursor_drm_fd->height};
+        vec2i cursor_pos = {cursor_drm_fd->x, cursor_drm_fd->y};
+        switch(cap_kms->monitor_rotation) {
+            case GSR_MONITOR_ROT_0:
+                break;
+            case GSR_MONITOR_ROT_90:
+                cursor_pos = swap_vec2i(cursor_pos);
+                cursor_pos.x = cap_kms->capture_size.x - cursor_pos.x;
+                // TODO: Remove this horrible hack
+                cursor_pos.x -= cursor_size.x;
+                break;
+            case GSR_MONITOR_ROT_180:
+                cursor_pos.x = cap_kms->capture_size.x - cursor_pos.x;
+                cursor_pos.y = cap_kms->capture_size.y - cursor_pos.y;
+                // TODO: Remove this horrible hack
+                cursor_pos.x -= cursor_size.x;
+                cursor_pos.y -= cursor_size.y;
+                break;
+            case GSR_MONITOR_ROT_270:
+                cursor_pos = swap_vec2i(cursor_pos);
+                cursor_pos.y = cap_kms->capture_size.y - cursor_pos.y;
+                // TODO: Remove this horrible hack
+                cursor_pos.y -= cursor_size.y;
+                break;
+        }
+
         const intptr_t img_attr_cursor[] = {
             EGL_LINUX_DRM_FOURCC_EXT,       cursor_drm_fd->pixel_format,
             EGL_WIDTH,                      cursor_drm_fd->width,
@@ -481,11 +536,10 @@ static int gsr_capture_kms_cuda_capture(gsr_capture *cap, AVFrame *frame) {
         cap_kms->params.egl->eglDestroyImage(cap_kms->params.egl->egl_display, cursor_image);
         cap_kms->params.egl->glBindTexture(GL_TEXTURE_EXTERNAL_OES, 0);
 
-        vec2i cursor_size = {cursor_drm_fd->width, cursor_drm_fd->height};
         gsr_color_conversion_draw(&cap_kms->color_conversion, cap_kms->cursor_texture,
-            (vec2i){cursor_drm_fd->x, cursor_drm_fd->y}, cursor_size,
+            cursor_pos, cursor_size,
             (vec2i){0, 0}, cursor_size,
-            0.0f, true);
+            texture_rotation, true);
     }
 
     cap_kms->params.egl->eglSwapBuffers(cap_kms->params.egl->egl_display, cap_kms->params.egl->egl_surface);
diff --git a/src/capture/kms_vaapi.c b/src/capture/kms_vaapi.c
index 28527cf..d86389c 100644
--- a/src/capture/kms_vaapi.c
+++ b/src/capture/kms_vaapi.c
@@ -46,6 +46,8 @@ typedef struct {
     AVCodecContext *video_codec_context;
     AVMasteringDisplayMetadata *mastering_display_metadata;
     AVContentLightMetadata *light_metadata;
+
+    gsr_monitor_rotation monitor_rotation;
 } gsr_capture_kms_vaapi;
 
 static int max_int(int a, int b) {
@@ -156,8 +158,16 @@ static int gsr_capture_kms_vaapi_start(gsr_capture *cap, AVCodecContext *video_c
         return -1;
     }
 
+    monitor.name = cap_kms->params.display_to_capture;
+    cap_kms->monitor_rotation = drm_monitor_get_display_server_rotation(cap_kms->params.egl, &monitor);
+
     cap_kms->capture_pos = monitor.pos;
-    cap_kms->capture_size = monitor.size;
+    if(cap_kms->monitor_rotation == GSR_MONITOR_ROT_90 || cap_kms->monitor_rotation == GSR_MONITOR_ROT_270) {
+        cap_kms->capture_size.x = monitor.size.y;
+        cap_kms->capture_size.y = monitor.size.x;
+    } else {
+        cap_kms->capture_size = monitor.size;
+    }
 
     /* Disable vsync */
     cap_kms->params.egl->eglSwapInterval(cap_kms->params.egl->egl_display, 0);
@@ -338,6 +348,16 @@ static bool gsr_capture_kms_vaapi_should_stop(gsr_capture *cap, bool *err) {
     return false;
 }
 
+static float monitor_rotation_to_radians(gsr_monitor_rotation rot) {
+    switch(rot) {
+        case GSR_MONITOR_ROT_0:   return 0.0f;
+        case GSR_MONITOR_ROT_90:  return M_PI_2;
+        case GSR_MONITOR_ROT_180: return M_PI;
+        case GSR_MONITOR_ROT_270: return M_PI + M_PI_2;
+    }
+    return 0.0f;
+}
+
 /* Prefer non combined planes */
 static gsr_kms_response_fd* find_drm_by_connector_id(gsr_kms_response *kms_response, uint32_t connector_id) {
     int index_combined = -1;
@@ -426,6 +446,13 @@ static void gsr_capture_kms_vaapi_set_hdr_metadata(gsr_capture_kms_vaapi *cap_km
     }
 }
 
+static vec2i swap_vec2i(vec2i value) {
+    int tmp = value.x;
+    value.x = value.y;
+    value.y = tmp;
+    return value;
+}
+
 static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
     gsr_capture_kms_vaapi *cap_kms = cap->priv;
 
@@ -518,12 +545,15 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
     cap_kms->params.egl->eglDestroyImage(cap_kms->params.egl->egl_display, image);
     cap_kms->params.egl->glBindTexture(GL_TEXTURE_2D, 0);
 
-    vec2i capture_pos = cap_kms->capture_pos;
+    // TODO: Test rotation with multiple monitors, different rotation setups
+    // TODO: Make rotation work on wayland
+    // TODO: Apply these changes to kms cuda too, and test that
 
+    vec2i capture_pos = cap_kms->capture_pos;
     if(!capture_is_combined_plane)
         capture_pos = (vec2i){drm_fd->x, drm_fd->y};
 
-    float texture_rotation = 0.0f;
+    const float texture_rotation = monitor_rotation_to_radians(cap_kms->monitor_rotation);
 
     gsr_color_conversion_draw(&cap_kms->color_conversion, cap_kms->input_texture,
         (vec2i){0, 0}, cap_kms->capture_size,
@@ -531,6 +561,32 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
         texture_rotation, false);
 
     if(cursor_drm_fd) {
+        const vec2i cursor_size = {cursor_drm_fd->width, cursor_drm_fd->height};
+        vec2i cursor_pos = {cursor_drm_fd->x, cursor_drm_fd->y};
+        switch(cap_kms->monitor_rotation) {
+            case GSR_MONITOR_ROT_0:
+                break;
+            case GSR_MONITOR_ROT_90:
+                cursor_pos = swap_vec2i(cursor_pos);
+                cursor_pos.x = cap_kms->capture_size.x - cursor_pos.x;
+                // TODO: Remove this horrible hack
+                cursor_pos.x -= cursor_size.x;
+                break;
+            case GSR_MONITOR_ROT_180:
+                cursor_pos.x = cap_kms->capture_size.x - cursor_pos.x;
+                cursor_pos.y = cap_kms->capture_size.y - cursor_pos.y;
+                // TODO: Remove this horrible hack
+                cursor_pos.x -= cursor_size.x;
+                cursor_pos.y -= cursor_size.y;
+                break;
+            case GSR_MONITOR_ROT_270:
+                cursor_pos = swap_vec2i(cursor_pos);
+                cursor_pos.y = cap_kms->capture_size.y - cursor_pos.y;
+                // TODO: Remove this horrible hack
+                cursor_pos.y -= cursor_size.y;
+                break;
+        }
+
         const intptr_t img_attr_cursor[] = {
             EGL_LINUX_DRM_FOURCC_EXT,       cursor_drm_fd->pixel_format,
             EGL_WIDTH,                      cursor_drm_fd->width,
@@ -549,11 +605,10 @@ static int gsr_capture_kms_vaapi_capture(gsr_capture *cap, AVFrame *frame) {
         cap_kms->params.egl->eglDestroyImage(cap_kms->params.egl->egl_display, cursor_image);
         cap_kms->params.egl->glBindTexture(GL_TEXTURE_2D, 0);
 
-        vec2i cursor_size = {cursor_drm_fd->width, cursor_drm_fd->height};
         gsr_color_conversion_draw(&cap_kms->color_conversion, cap_kms->cursor_texture,
-            (vec2i){cursor_drm_fd->x, cursor_drm_fd->y}, cursor_size,
+            cursor_pos, cursor_size,
             (vec2i){0, 0}, cursor_size,
-            0.0f, false);
+            texture_rotation, false);
     }
 
     cap_kms->params.egl->eglSwapBuffers(cap_kms->params.egl->egl_display, cap_kms->params.egl->egl_surface);
diff --git a/src/color_conversion.c b/src/color_conversion.c
index bc83ddd..0446c85 100644
--- a/src/color_conversion.c
+++ b/src/color_conversion.c
@@ -33,7 +33,7 @@ static float abs_f(float v) {
 #define RGB_TO_P010_LIMITED "const mat4 RGBtoYUV = mat4(0.225613, -0.119918,  0.429412, 0.000000,\n" \
                             "                           0.582282, -0.309494, -0.394875, 0.000000,\n" \
                             "                           0.050928,  0.429412, -0.034537, 0.000000,\n" \
-                            "                           0.062745,  0.500000,  0.500000, 1.000000)";
+                            "                           0.062745,  0.500000,  0.500000, 1.000000);"
 
 /* ITU-R BT709, full */
 /* https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.709-6-201506-I!!PDF-E.pdf */
@@ -74,19 +74,20 @@ static const char* color_format_range_get_transform_matrix(gsr_destination_color
     return NULL;
 }
 
-static int load_shader_bgr(gsr_shader *shader, gsr_egl *egl, int *rotation_uniform) {
+static int load_shader_bgr(gsr_shader *shader, gsr_egl *egl, gsr_color_uniforms *uniforms) {
     char vertex_shader[2048];
     snprintf(vertex_shader, sizeof(vertex_shader),
         "#version 300 es                                   \n"
         "in vec2 pos;                                      \n"
         "in vec2 texcoords;                                \n"
         "out vec2 texcoords_out;                           \n"
+        "uniform vec2 offset;                              \n"
         "uniform float rotation;                           \n"
         ROTATE_Z
         "void main()                                       \n"
         "{                                                 \n"
-        "  texcoords_out = texcoords;                      \n"
-        "  gl_Position = vec4(pos.x, pos.y, 0.0, 1.0) * rotate_z(rotation);    \n"
+        "  texcoords_out = (vec4(texcoords.x - 0.5, texcoords.y - 0.5, 0.0, 0.0) * rotate_z(rotation)).xy + vec2(0.5, 0.5);  \n"
+        "  gl_Position = vec4(offset.x, offset.y, 0.0, 0.0) + vec4(pos.x, pos.y, 0.0, 1.0);    \n"
         "}                                                 \n");
 
     char fragment_shader[] =
@@ -105,23 +106,25 @@ static int load_shader_bgr(gsr_shader *shader, gsr_egl *egl, int *rotation_unifo
 
     gsr_shader_bind_attribute_location(shader, "pos", 0);
     gsr_shader_bind_attribute_location(shader, "texcoords", 1);
-    *rotation_uniform = egl->glGetUniformLocation(shader->program_id, "rotation");
+    uniforms->offset = egl->glGetUniformLocation(shader->program_id, "offset");
+    uniforms->rotation = egl->glGetUniformLocation(shader->program_id, "rotation");
     return 0;
 }
 
-static int load_shader_bgr_external_texture(gsr_shader *shader, gsr_egl *egl, int *rotation_uniform) {
+static int load_shader_bgr_external_texture(gsr_shader *shader, gsr_egl *egl, gsr_color_uniforms *uniforms) {
     char vertex_shader[2048];
     snprintf(vertex_shader, sizeof(vertex_shader),
         "#version 300 es                                   \n"
         "in vec2 pos;                                      \n"
         "in vec2 texcoords;                                \n"
         "out vec2 texcoords_out;                           \n"
+        "uniform vec2 offset;                              \n"
         "uniform float rotation;                           \n"
         ROTATE_Z
         "void main()                                       \n"
         "{                                                 \n"
-        "  texcoords_out = texcoords;                      \n"
-        "  gl_Position = vec4(pos.x, pos.y, 0.0, 1.0) * rotate_z(rotation);    \n"
+        "  texcoords_out = (vec4(texcoords.x - 0.5, texcoords.y - 0.5, 0.0, 0.0) * rotate_z(rotation)).xy + vec2(0.5, 0.5);  \n"
+        "  gl_Position = vec4(offset.x, offset.y, 0.0, 0.0) + vec4(pos.x, pos.y, 0.0, 1.0);    \n"
         "}                                                 \n");
 
     char fragment_shader[] =
@@ -142,11 +145,12 @@ static int load_shader_bgr_external_texture(gsr_shader *shader, gsr_egl *egl, in
 
     gsr_shader_bind_attribute_location(shader, "pos", 0);
     gsr_shader_bind_attribute_location(shader, "texcoords", 1);
-    *rotation_uniform = egl->glGetUniformLocation(shader->program_id, "rotation");
+    uniforms->offset = egl->glGetUniformLocation(shader->program_id, "offset");
+    uniforms->rotation = egl->glGetUniformLocation(shader->program_id, "rotation");
     return 0;
 }
 
-static int load_shader_y(gsr_shader *shader, gsr_egl *egl, int *rotation_uniform, gsr_destination_color color_format, gsr_color_range color_range) {
+static int load_shader_y(gsr_shader *shader, gsr_egl *egl, gsr_color_uniforms *uniforms, gsr_destination_color color_format, gsr_color_range color_range) {
     const char *color_transform_matrix = color_format_range_get_transform_matrix(color_format, color_range);
 
     char vertex_shader[2048];
@@ -155,12 +159,13 @@ static int load_shader_y(gsr_shader *shader, gsr_egl *egl, int *rotation_uniform
         "in vec2 pos;                                      \n"
         "in vec2 texcoords;                                \n"
         "out vec2 texcoords_out;                           \n"
+        "uniform vec2 offset;                              \n"
         "uniform float rotation;                           \n"
         ROTATE_Z
         "void main()                                       \n"
         "{                                                 \n"
-        "  texcoords_out = texcoords;                      \n"
-        "  gl_Position = vec4(pos.x, pos.y, 0.0, 1.0) * rotate_z(rotation);    \n"
+        "  texcoords_out = (vec4(texcoords.x - 0.5, texcoords.y - 0.5, 0.0, 0.0) * rotate_z(rotation)).xy + vec2(0.5, 0.5);  \n"
+        "  gl_Position = vec4(offset.x, offset.y, 0.0, 0.0) + vec4(pos.x, pos.y, 0.0, 1.0);    \n"
         "}                                                 \n");
 
     char fragment_shader[2048];
@@ -183,11 +188,12 @@ static int load_shader_y(gsr_shader *shader, gsr_egl *egl, int *rotation_uniform
 
     gsr_shader_bind_attribute_location(shader, "pos", 0);
     gsr_shader_bind_attribute_location(shader, "texcoords", 1);
-    *rotation_uniform = egl->glGetUniformLocation(shader->program_id, "rotation");
+    uniforms->offset = egl->glGetUniformLocation(shader->program_id, "offset");
+    uniforms->rotation = egl->glGetUniformLocation(shader->program_id, "rotation");
     return 0;
 }
 
-static unsigned int load_shader_uv(gsr_shader *shader, gsr_egl *egl, int *rotation_uniform, gsr_destination_color color_format, gsr_color_range color_range) {
+static unsigned int load_shader_uv(gsr_shader *shader, gsr_egl *egl, gsr_color_uniforms *uniforms, gsr_destination_color color_format, gsr_color_range color_range) {
     const char *color_transform_matrix = color_format_range_get_transform_matrix(color_format, color_range);
 
     char vertex_shader[2048];
@@ -196,12 +202,13 @@ static unsigned int load_shader_uv(gsr_shader *shader, gsr_egl *egl, int *rotati
         "in vec2 pos;                                    \n"
         "in vec2 texcoords;                              \n"
         "out vec2 texcoords_out;                         \n"
+        "uniform vec2 offset;                              \n"
         "uniform float rotation;                         \n"
         ROTATE_Z
         "void main()                                     \n"
         "{                                               \n"
-        "  texcoords_out = texcoords;                    \n"
-        "  gl_Position = vec4(pos.x, pos.y, 0.0, 1.0) * rotate_z(rotation) * vec4(0.5, 0.5, 1.0, 1.0) - vec4(0.5, 0.5, 0.0, 0.0);   \n"
+        "  texcoords_out = (vec4(texcoords.x - 0.5, texcoords.y - 0.5, 0.0, 0.0) * rotate_z(rotation)).xy + vec2(0.5, 0.5);                      \n"
+        "  gl_Position = vec4(offset.x, offset.y, 0.0, 0.0) + vec4(pos.x, pos.y, 0.0, 1.0) * vec4(0.5, 0.5, 1.0, 1.0) - vec4(0.5, 0.5, 0.0, 0.0);   \n"
         "}                                               \n");
 
     char fragment_shader[2048];
@@ -224,7 +231,8 @@ static unsigned int load_shader_uv(gsr_shader *shader, gsr_egl *egl, int *rotati
 
     gsr_shader_bind_attribute_location(shader, "pos", 0);
     gsr_shader_bind_attribute_location(shader, "texcoords", 1);
-    *rotation_uniform = egl->glGetUniformLocation(shader->program_id, "rotation");
+    uniforms->offset = egl->glGetUniformLocation(shader->program_id, "offset");
+    uniforms->rotation = egl->glGetUniformLocation(shader->program_id, "rotation");
     return 0;
 }
 
@@ -291,12 +299,12 @@ int gsr_color_conversion_init(gsr_color_conversion *self, const gsr_color_conver
                 return -1;
             }
 
-            if(load_shader_bgr(&self->shaders[0], self->params.egl, &self->rotation_uniforms[0]) != 0) {
+            if(load_shader_bgr(&self->shaders[0], self->params.egl, &self->uniforms[0]) != 0) {
                 fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to load bgr shader\n");
                 goto err;
             }
 
-            if(load_shader_bgr_external_texture(&self->shaders[1], self->params.egl, &self->rotation_uniforms[1]) != 0) {
+            if(load_shader_bgr_external_texture(&self->shaders[1], self->params.egl, &self->uniforms[1]) != 0) {
                 fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to load bgr shader (external texture)\n");
                 goto err;
             }
@@ -309,12 +317,12 @@ int gsr_color_conversion_init(gsr_color_conversion *self, const gsr_color_conver
                 return -1;
             }
 
-            if(load_shader_y(&self->shaders[0], self->params.egl, &self->rotation_uniforms[0], params->destination_color, params->color_range) != 0) {
+            if(load_shader_y(&self->shaders[0], self->params.egl, &self->uniforms[0], params->destination_color, params->color_range) != 0) {
                 fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to load Y shader\n");
                 goto err;
             }
 
-            if(load_shader_uv(&self->shaders[1], self->params.egl, &self->rotation_uniforms[1], params->destination_color, params->color_range) != 0) {
+            if(load_shader_uv(&self->shaders[1], self->params.egl, &self->uniforms[1], params->destination_color, params->color_range) != 0) {
                 fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to load UV shader\n");
                 goto err;
             }
@@ -363,6 +371,9 @@ void gsr_color_conversion_deinit(gsr_color_conversion *self) {
 
 /* |source_pos| is in pixel coordinates and |source_size|  */
 void gsr_color_conversion_draw(gsr_color_conversion *self, unsigned int texture_id, vec2i source_pos, vec2i source_size, vec2i texture_pos, vec2i texture_size, float rotation, bool external_texture) {
+    // TODO: Remove this crap
+    rotation = M_PI*2.0f - rotation;
+
     /* TODO: Do not call this every frame? */
     vec2i dest_texture_size = {0, 0};
     self->params.egl->glBindTexture(GL_TEXTURE_2D, self->params.destination_textures[0]);
@@ -383,6 +394,7 @@ void gsr_color_conversion_draw(gsr_color_conversion *self, unsigned int texture_
         self->params.egl->glGetTexLevelParameteriv(texture_target, 0, GL_TEXTURE_HEIGHT, &source_texture_size.y);
     }
 
+    // TODO: Remove this crap
     if(abs_f(M_PI * 0.5f - rotation) <= 0.001f || abs_f(M_PI * 1.5f - rotation) <= 0.001f) {
         float tmp = source_texture_size.x;
         source_texture_size.x = source_texture_size.y;
@@ -410,13 +422,13 @@ void gsr_color_conversion_draw(gsr_color_conversion *self, unsigned int texture_
     };
 
     const float vertices[] = {
-        -1.0f + pos_norm.x,               -1.0f + pos_norm.y + size_norm.y, texture_pos_norm.x,                       texture_pos_norm.y + texture_size_norm.y,
-        -1.0f + pos_norm.x,               -1.0f + pos_norm.y,               texture_pos_norm.x,                       texture_pos_norm.y,
-        -1.0f + pos_norm.x + size_norm.x, -1.0f + pos_norm.y,               texture_pos_norm.x + texture_size_norm.x, texture_pos_norm.y,
+        -1.0f + 0.0f,               -1.0f + 0.0f + size_norm.y, texture_pos_norm.x,                       texture_pos_norm.y + texture_size_norm.y,
+        -1.0f + 0.0f,               -1.0f + 0.0f,               texture_pos_norm.x,                       texture_pos_norm.y,
+        -1.0f + 0.0f + size_norm.x, -1.0f + 0.0f,               texture_pos_norm.x + texture_size_norm.x, texture_pos_norm.y,
 
-        -1.0f + pos_norm.x,               -1.0f + pos_norm.y + size_norm.y, texture_pos_norm.x,                       texture_pos_norm.y + texture_size_norm.y,
-        -1.0f + pos_norm.x + size_norm.x, -1.0f + pos_norm.y,               texture_pos_norm.x + texture_size_norm.x, texture_pos_norm.y,
-        -1.0f + pos_norm.x + size_norm.x, -1.0f + pos_norm.y + size_norm.y, texture_pos_norm.x + texture_size_norm.x, texture_pos_norm.y + texture_size_norm.y
+        -1.0f + 0.0f,               -1.0f + 0.0f + size_norm.y, texture_pos_norm.x,                       texture_pos_norm.y + texture_size_norm.y,
+        -1.0f + 0.0f + size_norm.x, -1.0f + 0.0f,               texture_pos_norm.x + texture_size_norm.x, texture_pos_norm.y,
+        -1.0f + 0.0f + size_norm.x, -1.0f + 0.0f + size_norm.y, texture_pos_norm.x + texture_size_norm.x, texture_pos_norm.y + texture_size_norm.y
     };
 
     self->params.egl->glBindVertexArray(self->vertex_array_object_id);
@@ -432,10 +444,12 @@ void gsr_color_conversion_draw(gsr_color_conversion *self, unsigned int texture_
 
         if(external_texture) {
             gsr_shader_use(&self->shaders[1]);
-            self->params.egl->glUniform1f(self->rotation_uniforms[1], rotation);
+            self->params.egl->glUniform1f(self->uniforms[1].rotation, rotation);
+            self->params.egl->glUniform2f(self->uniforms[1].offset, pos_norm.x, pos_norm.y);
         } else {
             gsr_shader_use(&self->shaders[0]);
-            self->params.egl->glUniform1f(self->rotation_uniforms[0], rotation);
+            self->params.egl->glUniform1f(self->uniforms[0].rotation, rotation);
+            self->params.egl->glUniform2f(self->uniforms[0].offset, pos_norm.x, pos_norm.y);
         }
         self->params.egl->glDrawArrays(GL_TRIANGLES, 0, 6);
     }
@@ -445,7 +459,8 @@ void gsr_color_conversion_draw(gsr_color_conversion *self, unsigned int texture_
         //cap_xcomp->params.egl->glClear(GL_COLOR_BUFFER_BIT);
 
         gsr_shader_use(&self->shaders[1]);
-        self->params.egl->glUniform1f(self->rotation_uniforms[1], rotation);
+        self->params.egl->glUniform1f(self->uniforms[1].rotation, rotation);
+        self->params.egl->glUniform2f(self->uniforms[1].offset, pos_norm.x, pos_norm.y);
         self->params.egl->glDrawArrays(GL_TRIANGLES, 0, 6);
     }
 
diff --git a/src/egl.c b/src/egl.c
index f1e3885..7971dbd 100644
--- a/src/egl.c
+++ b/src/egl.c
@@ -23,10 +23,10 @@ static void output_handle_geometry(void *data, struct wl_output *wl_output,
     (void)subpixel;
     (void)make;
     (void)model;
-    (void)transform;
     gsr_wayland_output *gsr_output = data;
     gsr_output->pos.x = x;
     gsr_output->pos.y = y;
+    gsr_output->transform = transform;
 }
 
 static void output_handle_mode(void *data, struct wl_output *wl_output, uint32_t flags, int32_t width, int32_t height, int32_t refresh) {
@@ -101,6 +101,7 @@ static void registry_add_object(void *data, struct wl_registry *registry, uint32
             .output = wl_registry_bind(registry, name, &wl_output_interface, 4),
             .pos = { .x = 0, .y = 0 },
             .size = { .x = 0, .y = 0 },
+            .transform = 0,
             .name = NULL,
         };
         wl_output_add_listener(gsr_output->output, &output_listener, gsr_output);
@@ -322,6 +323,7 @@ static bool gsr_egl_load_gl(gsr_egl *self, void *library) {
         { (void**)&self->glBlendFunc, "glBlendFunc" },
         { (void**)&self->glGetUniformLocation, "glGetUniformLocation" },
         { (void**)&self->glUniform1f, "glUniform1f" },
+        { (void**)&self->glUniform2f, "glUniform2f" },
 
         { NULL, NULL }
     };
diff --git a/src/main.cpp b/src/main.cpp
index 4a04206..31b58d7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -851,6 +851,7 @@ static void usage_full() {
     fprintf(stderr, "\n");
     fprintf(stderr, "  -cr   Color range. Should be either 'limited' (aka mpeg) or 'full' (aka jpeg). Defaults to 'limited'.\n");
     fprintf(stderr, "        Limited color range means that colors are in range 16-235 while full color range means that colors are in range 0-255 (when not recording with hdr).\n");
+    fprintf(stderr, "        Note that some buggy video players (such as vlc) are unable to correctly display videos in full color range.\n");
     fprintf(stderr, "\n");
     fprintf(stderr, "  -v    Prints per second, fps updates. Optional, set to 'yes' by default.\n");
     fprintf(stderr, "\n");
diff --git a/src/utils.c b/src/utils.c
index 8316fa4..f98527f 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -7,6 +7,14 @@
 #include <xf86drmMode.h>
 #include <xf86drm.h>
 #include <stdlib.h>
+#include <X11/Xatom.h>
+
+typedef enum {
+    X11_ROT_0    = 1 << 0,
+    X11_ROT_90   = 1 << 1,
+    X11_ROT_180  = 1 << 2,
+    X11_ROT_270  = 1 << 3
+} X11Rotation;
 
 double clock_get_monotonic_seconds(void) {
     struct timespec ts;
@@ -24,11 +32,49 @@ static const XRRModeInfo* get_mode_info(const XRRScreenResources *sr, RRMode id)
     return NULL;
 }
 
+static gsr_monitor_rotation x11_rotation_to_gsr_rotation(X11Rotation rot) {
+    switch(rot) {
+        case X11_ROT_0:   return GSR_MONITOR_ROT_0;
+        case X11_ROT_90:  return GSR_MONITOR_ROT_90;
+        case X11_ROT_180: return GSR_MONITOR_ROT_180;
+        case X11_ROT_270: return GSR_MONITOR_ROT_270;
+    }
+    return GSR_MONITOR_ROT_0;
+}
+
+static gsr_monitor_rotation wayland_transform_to_gsr_rotation(int32_t rot) {
+    switch(rot) {
+        case 0: return GSR_MONITOR_ROT_0;
+        case 1: return GSR_MONITOR_ROT_90;
+        case 2: return GSR_MONITOR_ROT_180;
+        case 3: return GSR_MONITOR_ROT_270;
+    }
+    return GSR_MONITOR_ROT_0;
+}
+
+static uint32_t x11_output_get_connector_id(Display *dpy, RROutput output, Atom randr_connector_id_atom) {
+    Atom type = 0;
+    int format = 0;
+    unsigned long bytes_after = 0;
+    unsigned long nitems = 0;
+    unsigned char *prop = NULL;
+    XRRGetOutputProperty(dpy, output, randr_connector_id_atom, 0, 128, false, false, AnyPropertyType, &type, &format, &nitems, &bytes_after, &prop);
+
+    long result = 0;
+    if(type == XA_INTEGER && format == 32)
+        result = *(long*)prop;
+
+    free(prop);
+    return result;
+}
+
 void for_each_active_monitor_output_x11(Display *display, active_monitor_callback callback, void *userdata) {
     XRRScreenResources *screen_res = XRRGetScreenResources(display, DefaultRootWindow(display));
     if(!screen_res)
         return;
 
+    const Atom randr_connector_id_atom = XInternAtom(display, "CONNECTOR_ID", False);
+
     char display_name[256];
     for(int i = 0; i < screen_res->noutput; ++i) {
         XRROutputInfo *out_info = XRRGetOutputInfo(display, screen_res, screen_res->outputs[i]);
@@ -40,13 +86,15 @@ void for_each_active_monitor_output_x11(Display *display, active_monitor_callbac
                     memcpy(display_name, out_info->name, out_info->nameLen);
                     display_name[out_info->nameLen] = '\0';
 
-                    gsr_monitor monitor = {
+                    const gsr_monitor monitor = {
                         .name = display_name,
                         .name_len = out_info->nameLen,
                         .pos = { .x = crt_info->x, .y = crt_info->y },
                         .size = { .x = (int)crt_info->width, .y = (int)crt_info->height },
                         .crt_info = crt_info,
-                        .connector_id = 0 // TODO: Get connector id
+                        .connector_id = x11_output_get_connector_id(display, screen_res->outputs[i], randr_connector_id_atom),
+                        .rotation = x11_rotation_to_gsr_rotation(crt_info->rotation),
+                        .monitor_identifier = 0
                     };
                     callback(&monitor, userdata);
                 }
@@ -64,6 +112,7 @@ void for_each_active_monitor_output_x11(Display *display, active_monitor_callbac
 typedef struct {
     int type;
     int count;
+    int count_active;
 } drm_connector_type_count;
 
 #define CONNECTOR_TYPE_COUNTS 32
@@ -80,6 +129,7 @@ static drm_connector_type_count* drm_connector_types_get_index(drm_connector_typ
     const int index = *num_type_counts;
     type_counts[index].type = connector_type;
     type_counts[index].count = 0;
+    type_counts[index].count_active = 0;
     ++*num_type_counts;
     return &type_counts[index];
 }
@@ -99,18 +149,51 @@ static bool connector_get_property_by_name(int drmfd, drmModeConnectorPtr props,
     return false;
 }
 
+/* TODO: Support more connector types*/
+static int get_connector_type_by_name(const char *name) {
+    int len = strlen(name);
+    if(len >= 5 && strncmp(name, "HDMI-", 5) == 0)
+        return 1;
+    else if(len >= 3 && strncmp(name, "DP-", 3) == 0)
+        return 2;
+    else if(len >= 12 && strncmp(name, "DisplayPort-", 12) == 0)
+        return 3;
+    else
+        return -1;
+}
+
+static uint32_t monitor_identifier_from_type_and_count(int monitor_type_index, int monitor_type_count) {
+    return ((uint32_t)monitor_type_index << 16) | ((uint32_t)monitor_type_count);
+}
+
 static void for_each_active_monitor_output_wayland(const gsr_egl *egl, active_monitor_callback callback, void *userdata) {
+    drm_connector_type_count type_counts[CONNECTOR_TYPE_COUNTS];
+    int num_type_counts = 0;
+
     for(int i = 0; i < egl->wayland.num_outputs; ++i) {
-        if(!egl->wayland.outputs[i].name)
+        const gsr_wayland_output *output = &egl->wayland.outputs[i];
+        if(!output->name)
             continue;
 
-        gsr_monitor monitor = {
-            .name = egl->wayland.outputs[i].name,
-            .name_len = strlen(egl->wayland.outputs[i].name),
-            .pos = { .x = egl->wayland.outputs[i].pos.x, .y = egl->wayland.outputs[i].pos.y },
-            .size = { .x = egl->wayland.outputs[i].size.x, .y = egl->wayland.outputs[i].size.y },
+        const int connector_type_index = get_connector_type_by_name(output->name);
+        drm_connector_type_count *connector_type = NULL;
+        if(connector_type_index != -1)
+            connector_type = drm_connector_types_get_index(type_counts, &num_type_counts, connector_type_index);
+        
+        if(connector_type) {
+            ++connector_type->count;
+            ++connector_type->count_active;
+        }
+
+        const gsr_monitor monitor = {
+            .name = output->name,
+            .name_len = strlen(output->name),
+            .pos = { .x = output->pos.x, .y = output->pos.y },
+            .size = { .x = output->size.x, .y = output->size.y },
             .crt_info = NULL,
-            .connector_id = 0
+            .connector_id = 0,
+            .rotation = wayland_transform_to_gsr_rotation(output->transform),
+            .monitor_identifier = connector_type ? monitor_identifier_from_type_and_count(connector_type_index, connector_type->count_active) : 0
         };
         callback(&monitor, userdata);
     }
@@ -145,19 +228,25 @@ static void for_each_active_monitor_output_drm(const gsr_egl *egl, active_monito
                 continue;
             }
 
+            if(connector_type)
+                ++connector_type->count_active;
+
             uint64_t crtc_id = 0;
             connector_get_property_by_name(fd, connector, "CRTC_ID", &crtc_id);
 
             drmModeCrtcPtr crtc = drmModeGetCrtc(fd, crtc_id);
             if(connector_type && crtc_id > 0 && crtc && connection_name_len + 5 < (int)sizeof(display_name)) {
                 const int display_name_len = snprintf(display_name, sizeof(display_name), "%s-%d", connection_name, connector_type->count);
-                gsr_monitor monitor = {
+                const int connector_type_index_name = get_connector_type_by_name(display_name);
+                const gsr_monitor monitor = {
                     .name = display_name,
                     .name_len = display_name_len,
                     .pos = { .x = crtc->x, .y = crtc->y },
                     .size = { .x = (int)crtc->width, .y = (int)crtc->height },
                     .crt_info = NULL,
-                    .connector_id = connector->connector_id
+                    .connector_id = connector->connector_id,
+                    .rotation = GSR_MONITOR_ROT_0,
+                    .monitor_identifier = connector_type_index_name != -1 ? monitor_identifier_from_type_and_count(connector_type_index_name, connector_type->count_active) : 0
                 };
                 callback(&monitor, userdata);
             }
@@ -192,6 +281,9 @@ static void get_monitor_by_name_callback(const gsr_monitor *monitor, void *userd
     if(!data->found_monitor && strcmp(data->name, monitor->name) == 0) {
         data->monitor->pos = monitor->pos;
         data->monitor->size = monitor->size;
+        data->monitor->connector_id = monitor->connector_id;
+        data->monitor->rotation = monitor->rotation;
+        data->monitor->monitor_identifier = monitor->monitor_identifier;
         data->found_monitor = true;
     }
 }
@@ -206,6 +298,38 @@ bool get_monitor_by_name(const gsr_egl *egl, gsr_connection_type connection_type
     return userdata.found_monitor;
 }
 
+typedef struct {
+    const gsr_monitor *monitor;
+    gsr_monitor_rotation rotation;
+} get_monitor_by_connector_id_userdata;
+
+static void get_monitor_by_connector_id_callback(const gsr_monitor *monitor, void *userdata) {
+    get_monitor_by_connector_id_userdata *data = (get_monitor_by_connector_id_userdata*)userdata;
+    if(monitor->connector_id == data->monitor->connector_id ||
+        (!monitor->connector_id && monitor->monitor_identifier == data->monitor->monitor_identifier))
+    {
+        data->rotation = monitor->rotation;
+    }
+}
+
+gsr_monitor_rotation drm_monitor_get_display_server_rotation(const gsr_egl *egl, const gsr_monitor *monitor) {
+    if(egl->wayland.dpy) {
+        get_monitor_by_connector_id_userdata userdata;
+        userdata.monitor = monitor;
+        userdata.rotation = GSR_MONITOR_ROT_0;
+        for_each_active_monitor_output_wayland(egl, get_monitor_by_connector_id_callback, &userdata);
+        return userdata.rotation;
+    } else {
+        get_monitor_by_connector_id_userdata userdata;
+        userdata.monitor = monitor;
+        userdata.rotation = GSR_MONITOR_ROT_0;
+        for_each_active_monitor_output_x11(egl->x11.dpy, get_monitor_by_connector_id_callback, &userdata);
+        return userdata.rotation;
+    }
+
+    return GSR_MONITOR_ROT_0;
+}
+
 bool gl_get_gpu_info(gsr_egl *egl, gsr_gpu_info *info) {
     const char *software_renderers[] = { "llvmpipe", "SWR", "softpipe", NULL };
     bool supported = true;