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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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55
src/render/gpu/SDL_render_gpu.c
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@@ -29,11 +29,19 @@
#include "SDL_pipeline_gpu.h"
#include "SDL_shaders_gpu.h"
typedef struct GPU_ShaderUniformData
typedef struct GPU_VertexShaderUniformData
{
Float4X4 mvp;
SDL_FColor color;
} GPU_ShaderUniformData;
} GPU_VertexShaderUniformData;
typedef struct GPU_FragmentShaderUniformData
{
float texel_width;
float texel_height;
float texture_width;
float texture_height;
} GPU_FragmentShaderUniformData;
typedef struct GPU_RenderData
{
@@ -73,10 +81,9 @@ typedef struct GPU_RenderData
SDL_FColor draw_color;
bool scissor_enabled;
bool scissor_was_enabled;
GPU_ShaderUniformData shader_data;
} state;
SDL_GPUSampler *samplers[2][2];
SDL_GPUSampler *samplers[3][2];
} GPU_RenderData;
typedef struct GPU_TextureData
@@ -469,7 +476,7 @@ static SDL_GPURenderPass *RestartRenderPass(GPU_RenderData *data)
static void PushVertexUniforms(GPU_RenderData *data, SDL_RenderCommand *cmd)
{
GPU_ShaderUniformData uniforms;
GPU_VertexShaderUniformData uniforms;
SDL_zero(uniforms);
uniforms.mvp.m[0][0] = 2.0f / data->state.viewport.w;
uniforms.mvp.m[1][1] = -2.0f / data->state.viewport.h;
@@ -483,8 +490,25 @@ static void PushVertexUniforms(GPU_RenderData *data, SDL_RenderCommand *cmd)
SDL_PushGPUVertexUniformData(data->state.command_buffer, 0, &uniforms, sizeof(uniforms));
}
static void PushFragmentUniforms(GPU_RenderData *data, SDL_RenderCommand *cmd)
{
if (cmd->data.draw.texture &&
cmd->data.draw.texture_scale_mode == SDL_SCALEMODE_PIXELART) {
SDL_Texture *texture = cmd->data.draw.texture;
GPU_FragmentShaderUniformData uniforms;
SDL_zero(uniforms);
uniforms.texture_width = texture->w;
uniforms.texture_height = texture->h;
uniforms.texel_width = 1.0f / uniforms.texture_width;
uniforms.texel_height = 1.0f / uniforms.texture_height;
SDL_PushGPUFragmentUniformData(data->state.command_buffer, 0, &uniforms, sizeof(uniforms));
}
}
static SDL_GPUSampler **SamplerPointer(GPU_RenderData *data, SDL_TextureAddressMode address_mode, SDL_ScaleMode scale_mode)
{
SDL_assert(scale_mode < SDL_arraysize(data->samplers));
SDL_assert(address_mode < SDL_arraysize(data->samplers[0]));
return &data->samplers[scale_mode][address_mode - 1];
}
@@ -525,9 +549,17 @@ static void Draw(
if (texture) {
v_shader = VERT_SHADER_TRI_TEXTURE;
if (texture->format == SDL_PIXELFORMAT_RGBA32 || texture->format == SDL_PIXELFORMAT_BGRA32) {
f_shader = FRAG_SHADER_TEXTURE_RGBA;
if (cmd->data.draw.texture_scale_mode == SDL_SCALEMODE_PIXELART) {
f_shader = FRAG_SHADER_TEXTURE_RGBA_PIXELART;
} else {
f_shader = FRAG_SHADER_TEXTURE_RGBA;
}
} else {
f_shader = FRAG_SHADER_TEXTURE_RGB;
if (cmd->data.draw.texture_scale_mode == SDL_SCALEMODE_PIXELART) {
f_shader = FRAG_SHADER_TEXTURE_RGB_PIXELART;
} else {
f_shader = FRAG_SHADER_TEXTURE_RGB;
}
}
} else {
v_shader = VERT_SHADER_TRI_COLOR;
@@ -566,6 +598,7 @@ static void Draw(
sampler_bind.texture = tdata->texture;
SDL_BindGPUFragmentSamplers(pass, 0, &sampler_bind, 1);
}
PushFragmentUniforms(data, cmd);
SDL_GPUBufferBinding buffer_bind;
SDL_zero(buffer_bind);
@@ -1118,6 +1151,10 @@ static bool InitSamplers(GPU_RenderData *data)
{ SDL_TEXTURE_ADDRESS_CLAMP, SDL_SCALEMODE_LINEAR },
{ SDL_GPU_SAMPLERADDRESSMODE_REPEAT, SDL_GPU_FILTER_LINEAR, SDL_GPU_SAMPLERMIPMAPMODE_LINEAR, 0 },
},
{
{ SDL_TEXTURE_ADDRESS_CLAMP, SDL_SCALEMODE_PIXELART },
{ SDL_GPU_SAMPLERADDRESSMODE_REPEAT, SDL_GPU_FILTER_NEAREST, SDL_GPU_SAMPLERMIPMAPMODE_NEAREST, 0 },
},
{
{ SDL_TEXTURE_ADDRESS_WRAP, SDL_SCALEMODE_NEAREST },
{ SDL_GPU_SAMPLERADDRESSMODE_REPEAT, SDL_GPU_FILTER_NEAREST, SDL_GPU_SAMPLERMIPMAPMODE_NEAREST, 0 },
@@ -1126,6 +1163,10 @@ static bool InitSamplers(GPU_RenderData *data)
{ SDL_TEXTURE_ADDRESS_WRAP, SDL_SCALEMODE_LINEAR },
{ SDL_GPU_SAMPLERADDRESSMODE_REPEAT, SDL_GPU_FILTER_LINEAR, SDL_GPU_SAMPLERMIPMAPMODE_LINEAR, 0 },
},
{
{ SDL_TEXTURE_ADDRESS_WRAP, SDL_SCALEMODE_PIXELART },
{ SDL_GPU_SAMPLERADDRESSMODE_REPEAT, SDL_GPU_FILTER_NEAREST, SDL_GPU_SAMPLERMIPMAPMODE_NEAREST, 0 },
},
};
for (Uint32 i = 0; i < SDL_arraysize(configs); ++i) {