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-rw-r--r--include/mgl/gl.h1
-rw-r--r--include/mgl/graphics/sprite.h6
-rw-r--r--src/gl.c1
-rw-r--r--src/graphics/sprite.c25
-rw-r--r--tests/main.c11
5 files changed, 35 insertions, 9 deletions
diff --git a/include/mgl/gl.h b/include/mgl/gl.h
index 75bc764..7dc1dd7 100644
--- a/include/mgl/gl.h
+++ b/include/mgl/gl.h
@@ -43,6 +43,7 @@ typedef struct {
void (*glLoadIdentity)(void);
void (*glLoadMatrixf)(const float *m);
void (*glTranslatef)(float x, float y, float z);
+ void (*glRotatef)(float angle, float x, float y, float z);
void (*glGenBuffers)(int n, unsigned int *buffers);
void (*glBindBuffer)(unsigned int target, unsigned int buffer);
void (*glDeleteBuffers)(int n, const unsigned int *buffers);
diff --git a/include/mgl/graphics/sprite.h b/include/mgl/graphics/sprite.h
index 03f81ab..64d9c03 100644
--- a/include/mgl/graphics/sprite.h
+++ b/include/mgl/graphics/sprite.h
@@ -12,15 +12,19 @@ typedef struct {
mgl_color color;
mgl_vec2f position;
mgl_vec2f scale;
+ mgl_vec2f origin; /* top left by default (0, 0) */
+ float rotation; /* in degrees */
} mgl_sprite;
/* |texture| may be NULL */
-void mgl_sprite_init(mgl_sprite *self, mgl_texture *texture, float x, float y);
+void mgl_sprite_init(mgl_sprite *self, mgl_texture *texture);
/* |texture| may be NULL */
void mgl_sprite_set_texture(mgl_sprite *self, mgl_texture *texture);
void mgl_sprite_set_position(mgl_sprite *self, mgl_vec2f position);
void mgl_sprite_set_color(mgl_sprite *self, mgl_color color);
+void mgl_sprite_set_rotation(mgl_sprite *self, float degrees);
+void mgl_sprite_set_origin(mgl_sprite *self, mgl_vec2f origin);
void mgl_sprite_draw(mgl_context *context, mgl_sprite *sprite);
#endif /* MGL_SPRITE_H */
diff --git a/src/gl.c b/src/gl.c
index 5999b80..4d8fb58 100644
--- a/src/gl.c
+++ b/src/gl.c
@@ -57,6 +57,7 @@ int mgl_gl_load(mgl_gl *self) {
{ &self->glLoadIdentity, "glLoadIdentity" },
{ &self->glLoadMatrixf, "glLoadMatrixf" },
{ &self->glTranslatef, "glTranslatef" },
+ { &self->glRotatef, "glRotatef" },
{ &self->glGenBuffers, "glGenBuffers" },
{ &self->glBindBuffer, "glBindBuffer" },
{ &self->glDeleteBuffers, "glDeleteBuffers" },
diff --git a/src/graphics/sprite.c b/src/graphics/sprite.c
index 2aecdd1..df3e902 100644
--- a/src/graphics/sprite.c
+++ b/src/graphics/sprite.c
@@ -2,11 +2,13 @@
#include "../../include/mgl/graphics/texture.h"
#include "../../include/mgl/mgl.h"
-void mgl_sprite_init(mgl_sprite *self, mgl_texture *texture, float x, float y) {
+void mgl_sprite_init(mgl_sprite *self, mgl_texture *texture) {
self->texture = texture;
self->color = (mgl_color){ 255, 255, 255, 255 };
- self->position = (mgl_vec2f){ x, y };
+ self->position = (mgl_vec2f){ 0.0f, 0.0f };
self->scale = (mgl_vec2f){ 1.0f, 1.0f };
+ self->origin = (mgl_vec2f){ 0.0f, 0.0f };
+ self->rotation = 0.0f;
}
void mgl_sprite_set_texture(mgl_sprite *self, mgl_texture *texture) {
@@ -21,6 +23,14 @@ void mgl_sprite_set_color(mgl_sprite *self, mgl_color color) {
self->color = color;
}
+void mgl_sprite_set_rotation(mgl_sprite *self, float degrees) {
+ self->rotation = degrees;
+}
+
+void mgl_sprite_set_origin(mgl_sprite *self, mgl_vec2f origin) {
+ self->origin = origin;
+}
+
/* TODO: Cache texture bind to not bind texture if its already bound and do not bind texture 0 */
void mgl_sprite_draw(mgl_context *context, mgl_sprite *sprite) {
if(!sprite->texture)
@@ -35,18 +45,21 @@ void mgl_sprite_draw(mgl_context *context, mgl_sprite *sprite) {
context->gl.glColor4ub(sprite->color.r, sprite->color.g, sprite->color.b, sprite->color.a);
mgl_texture_use(sprite->texture);
+ context->gl.glTranslatef(sprite->position.x, sprite->position.y, 0.0f);
+ context->gl.glRotatef(sprite->rotation, 0.0f, 0.0f, 1.0f);
context->gl.glBegin(GL_QUADS);
context->gl.glTexCoord2f(0.0f, 0.0f);
- context->gl.glVertex3f(sprite->position.x, sprite->position.y, 0.0f);
+ context->gl.glVertex3f(-sprite->origin.x * sprite->scale.x, -sprite->origin.y * sprite->scale.y, 0.0f);
context->gl.glTexCoord2f(texture_right, 0.0f);
- context->gl.glVertex3f(sprite->position.x + sprite->texture->width * sprite->scale.x, sprite->position.y, 0.0f);
+ context->gl.glVertex3f((sprite->texture->width - sprite->origin.x) * sprite->scale.x, -sprite->origin.y * sprite->scale.y, 0.0f);
context->gl.glTexCoord2f(texture_right, texture_bottom);
- context->gl.glVertex3f(sprite->position.x + sprite->texture->width * sprite->scale.x, sprite->position.y + sprite->texture->height * sprite->scale.y, 0.0f);
+ context->gl.glVertex3f((sprite->texture->width - sprite->origin.x) * sprite->scale.x, (sprite->texture->height - sprite->origin.y) * sprite->scale.y, 0.0f);
context->gl.glTexCoord2f(0.0f, texture_bottom);
- context->gl.glVertex3f(sprite->position.x, sprite->position.y + sprite->texture->height * sprite->scale.y, 0.0f);
+ context->gl.glVertex3f(-sprite->origin.x * sprite->scale.x, (sprite->texture->height - sprite->origin.y) * sprite->scale.y, 0.0f);
context->gl.glEnd();
mgl_texture_use(NULL);
+ context->gl.glLoadIdentity(); /* TODO: Remove, but what about glRotatef above */
}
diff --git a/tests/main.c b/tests/main.c
index 3dc8c98..f76f384 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -34,9 +34,16 @@ static void draw(mgl_window *window, void *userdata) {
mgl_shader_program_set_uniform_vec2f(u->shader_program, "resolution", (mgl_vec2f){ u->texture->width, u->texture->height });
+ static float rot = 0.0f;
+ rot += 5.0f;
+
mgl_sprite sprite;
- mgl_sprite_init(&sprite, u->texture, 100.0f - 10.0f, 0.0f);
+ mgl_sprite_init(&sprite, u->texture);
+ mgl_sprite_set_position(&sprite, (mgl_vec2f){ 100.0f - 10.0f + u->texture->width * 0.5f * 2.0f, u->texture->height * 0.5f * 2.0f });
mgl_sprite_set_color(&sprite, (mgl_color){255, 255, 255, 128});
+ mgl_sprite_set_rotation(&sprite, rot);
+ mgl_sprite_set_origin(&sprite, (mgl_vec2f){ u->texture->width * 0.5f, u->texture->height * 0.5f });
+ sprite.scale = (mgl_vec2f){ 2.0f, 2.0f };
mgl_shader_program_use(u->shader_program);
mgl_sprite_draw(context, &sprite);
mgl_shader_program_use(NULL);
@@ -213,7 +220,7 @@ int main(int argc, char **argv) {
if(mgl_texture_init(&texture) != 0)
return 1;
- if(mgl_texture_load_from_file(&texture, "tests/X11.jpg", &(mgl_texture_load_options){ false, true }) != 0)
+ if(mgl_texture_load_from_file(&texture, "tests/X11.jpg", &(mgl_texture_load_options){ false, false }) != 0)
return 1;
if(mgl_mapped_file_load("/usr/share/fonts/noto/NotoSans-Regular.ttf", &font_file, &(mgl_memory_mapped_file_load_options){ .readable = true, .writable = false }) != 0)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 02:23:42 +0000