diff options
Diffstat (limited to 'src/graphics/texture.c')
| -rw-r--r-- | src/graphics/texture.c | 54 |
1 files changed, 49 insertions, 5 deletions
diff --git a/src/graphics/texture.c b/src/graphics/texture.c index b3a1fab..383f3f8 100644 --- a/src/graphics/texture.c +++ b/src/graphics/texture.c @@ -9,32 +9,51 @@ #define STB_IMAGE_IMPLEMENTATION #include "../../external/stb_image.h" +/* TODO: Check for glTexImage2D failure */ + static int mgl_texture_format_to_opengl_format(mgl_texture_format format) { switch(format) { + case MGL_TEXTURE_ALPHA: return GL_ALPHA8; case MGL_TEXTURE_GRAY: return GL_LUMINANCE8; case MGL_TEXTURE_GRAY_ALPHA: return GL_LUMINANCE8_ALPHA8; case MGL_TEXTURE_RGB: return GL_RGB8; - case MGL_TEXTURE_RGB_ALPHA: return GL_RGBA8; + case MGL_TEXTURE_RGBA: return GL_RGBA8; } return 0; } static int mgl_texture_format_to_compressed_opengl_format(mgl_texture_format format) { switch(format) { + case MGL_TEXTURE_ALPHA: return GL_ALPHA8; case MGL_TEXTURE_GRAY: return GL_LUMINANCE8; case MGL_TEXTURE_GRAY_ALPHA: return GL_LUMINANCE8_ALPHA8; case MGL_TEXTURE_RGB: return GL_COMPRESSED_RGB_S3TC_DXT1_EXT; - case MGL_TEXTURE_RGB_ALPHA: return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; + case MGL_TEXTURE_RGBA: return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; } return 0; } static int mgl_texture_format_to_source_opengl_format(mgl_texture_format format) { switch(format) { - case MGL_TEXTURE_GRAY: return GL_LUMINANCE8_ALPHA8; + case MGL_TEXTURE_ALPHA: return GL_ALPHA; + case MGL_TEXTURE_GRAY: return GL_LUMINANCE8; case MGL_TEXTURE_GRAY_ALPHA: return GL_LUMINANCE8_ALPHA8; case MGL_TEXTURE_RGB: return GL_RGB; - case MGL_TEXTURE_RGB_ALPHA: return GL_RGBA; + case MGL_TEXTURE_RGBA: return GL_RGBA; + } + return 0; +} + +static mgl_texture_format stbi_format_to_mgl_texture_format(int stbi_format) { + switch(stbi_format) { + case STBI_grey: + return MGL_TEXTURE_GRAY; + case STBI_grey_alpha: + return MGL_TEXTURE_GRAY_ALPHA; + case STBI_rgb: + return MGL_TEXTURE_RGB; + case STBI_rgb_alpha: + return MGL_TEXTURE_RGBA; } return 0; } @@ -50,11 +69,12 @@ int mgl_texture_load_from_file(mgl_texture *self, const char *filepath, mgl_text fprintf(stderr, "Error: failed to load image %s, error: %s\n", filepath, stbi_failure_reason()); return -1; } - self->format = format; + self->format = stbi_format_to_mgl_texture_format(format); mgl_context *context = mgl_get_context(); context->gl.glGenTextures(1, &self->id); if(self->id == 0) { + fprintf(stderr, "Error: failed to load image %s", filepath); stbi_image_free(image_data); return -1; } @@ -73,6 +93,30 @@ int mgl_texture_load_from_file(mgl_texture *self, const char *filepath, mgl_text return 0; } +int mgl_texture_load_from_memory(mgl_texture *self, const unsigned char *data, int width, int height, mgl_texture_format format, mgl_texture_load_options *load_options) { + self->id = 0; + self->width = width; + self->height = height; + self->format = format; + + mgl_context *context = mgl_get_context(); + context->gl.glGenTextures(1, &self->id); + if(self->id == 0) + return -1; + + const int opengl_texture_format = load_options && load_options->compressed ? mgl_texture_format_to_compressed_opengl_format(self->format) : mgl_texture_format_to_opengl_format(self->format); + + context->gl.glBindTexture(GL_TEXTURE_2D, self->id); + context->gl.glTexImage2D(GL_TEXTURE_2D, 0, opengl_texture_format, self->width, self->height, 0, mgl_texture_format_to_source_opengl_format(self->format), GL_UNSIGNED_BYTE, data); + context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + context->gl.glBindTexture(GL_TEXTURE_2D, 0); + + return 0; +} + void mgl_texture_unload(mgl_texture *self) { mgl_context *context = mgl_get_context(); if(self->id) { |