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Added SDL_SCALEMODE_PIXELART

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This is based on the algorithm presented by t3ssel8r:
https://www.youtube.com/watch?v=d6tp43wZqps
This commit is contained in:
Sam Lantinga 2025-03-12 08:45:25 -07:00
parent 853375da61
commit 3e9e22f17d
63 changed files with 15968 additions and 13125 deletions
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26
src/render/opengl/SDL_render_gl.c
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@ -68,6 +68,7 @@ typedef struct
int drawableh;
SDL_BlendMode blend;
GL_Shader shader;
float texel_size[4];
const float *shader_params;
bool cliprect_enabled_dirty;
bool cliprect_enabled;
@ -133,6 +134,7 @@ typedef struct
GLenum format;
GLenum formattype;
GL_Shader shader;
float texel_size[4];
const float *shader_params;
void *pixels;
int pitch;
@ -627,6 +629,11 @@ static bool GL_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, SDL_P
data->shader = SHADER_RGB;
}
data->texel_size[2] = texture->w;
data->texel_size[3] = texture->h;
data->texel_size[0] = 1.0f / data->texel_size[2];
data->texel_size[1] = 1.0f / data->texel_size[3];
#ifdef SDL_HAVE_YUV
if (data->yuv || data->nv12) {
if (data->yuv) {
@ -1081,6 +1088,7 @@ static bool SetTextureScaleMode(GL_RenderData *data, GLenum textype, SDL_ScaleMo
data->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
data->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
break;
case SDL_SCALEMODE_PIXELART: // Uses linear sampling
case SDL_SCALEMODE_LINEAR:
data->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
data->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
@ -1113,8 +1121,24 @@ static bool SetCopyState(GL_RenderData *data, const SDL_RenderCommand *cmd)
SDL_Texture *texture = cmd->data.draw.texture;
GL_TextureData *texturedata = (GL_TextureData *)texture->internal;
const GLenum textype = data->textype;
GL_Shader shader = texturedata->shader;
const float *shader_params = texturedata->shader_params;
SetDrawState(data, cmd, texturedata->shader, texturedata->shader_params);
if (cmd->data.draw.texture_scale_mode == SDL_SCALEMODE_PIXELART) {
switch (shader) {
case SHADER_RGB:
shader = SHADER_RGB_PIXELART;
shader_params = texturedata->texel_size;
break;
case SHADER_RGBA:
shader = SHADER_RGBA_PIXELART;
shader_params = texturedata->texel_size;
break;
default:
break;
}
}
SetDrawState(data, cmd, shader, shader_params);
if (texture != data->drawstate.texture) {
#ifdef SDL_HAVE_YUV