gl_shader: refactor texture sampler into its own function
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bae3799bd5
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@ -144,12 +144,40 @@ static bool IsPassThroughTevStage(const TevStageConfig& stage) {
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stage.GetColorMultiplier() == 1 && stage.GetAlphaMultiplier() == 1);
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}
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static std::string TexCoord(const PicaShaderConfig& config, int texture_unit) {
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if (texture_unit == 2 && config.state.texture2_use_coord1) {
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return "texcoord[1]";
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static std::string SampleTexture(const PicaShaderConfig& config, unsigned texture_unit) {
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const auto& state = config.state;
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switch (texture_unit) {
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case 0:
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// Only unit 0 respects the texturing type
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switch (state.texture0_type) {
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case TexturingRegs::TextureConfig::Texture2D:
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return "texture(tex[0], texcoord[0])";
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case TexturingRegs::TextureConfig::Projection2D:
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return "textureProj(tex[0], vec3(texcoord[0], texcoord0_w))";
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default:
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LOG_CRITICAL(HW_GPU, "Unhandled texture type %x",
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static_cast<int>(state.texture0_type));
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UNIMPLEMENTED();
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return "texture(tex[0], texcoord[0])";
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}
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case 1:
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return "texture(tex[1], texcoord[1])";
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case 2:
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if (state.texture2_use_coord1)
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return "texture(tex[2], texcoord[1])";
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else
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return "texture(tex[2], texcoord[2])";
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case 3:
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if (state.proctex.enable) {
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return "ProcTex()";
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} else {
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LOG_ERROR(Render_OpenGL, "Using Texture3 without enabling it");
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return "vec4(0.0)";
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}
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default:
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UNREACHABLE();
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return "";
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}
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return "texcoord[" + std::to_string(texture_unit) + "]";
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}
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/// Writes the specified TEV stage source component(s)
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@ -168,35 +196,16 @@ static void AppendSource(std::string& out, const PicaShaderConfig& config,
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out += "secondary_fragment_color";
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break;
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case Source::Texture0:
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// Only unit 0 respects the texturing type (according to 3DBrew)
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switch (state.texture0_type) {
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case TexturingRegs::TextureConfig::Texture2D:
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out += "texture(tex[0], texcoord[0])";
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break;
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case TexturingRegs::TextureConfig::Projection2D:
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out += "textureProj(tex[0], vec3(texcoord[0], texcoord0_w))";
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break;
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default:
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out += "texture(tex[0], texcoord[0])";
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LOG_CRITICAL(HW_GPU, "Unhandled texture type %x",
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static_cast<int>(state.texture0_type));
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UNIMPLEMENTED();
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break;
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}
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out += SampleTexture(config, 0);
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break;
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case Source::Texture1:
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out += "texture(tex[1], texcoord[1])";
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out += SampleTexture(config, 1);
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break;
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case Source::Texture2:
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out += "texture(tex[2], " + TexCoord(config, 2) + ")";
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out += SampleTexture(config, 2);
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break;
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case Source::Texture3:
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if (config.state.proctex.enable) {
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out += "ProcTex()";
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} else {
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LOG_ERROR(Render_OpenGL, "Using Texture3 without enabling it");
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out += "vec4(0.0)";
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}
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out += SampleTexture(config, 3);
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break;
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case Source::PreviousBuffer:
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out += "combiner_buffer";
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@ -506,18 +515,8 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
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if (lighting.bump_mode == LightingRegs::LightingBumpMode::NormalMap) {
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// Bump mapping is enabled using a normal map, read perturbation vector from the selected
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// texture
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if (lighting.bump_selector == 3) {
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if (config.state.proctex.enable) {
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out += "vec3 surface_normal = 2.0 * ProcTex().rgb - 1.0;\n";
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} else {
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LOG_ERROR(Render_OpenGL, "Using Texture3 without enabling it");
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out += "vec3 surface_normal = vec3(-1.0);\n";
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}
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} else {
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std::string bump_selector = std::to_string(lighting.bump_selector);
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out += "vec3 surface_normal = 2.0 * texture(tex[" + bump_selector + "], " +
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TexCoord(config, lighting.bump_selector) + ").rgb - 1.0;\n";
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}
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out += "vec3 surface_normal = 2.0 * (" + SampleTexture(config, lighting.bump_selector) +
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").rgb - 1.0;\n";
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// Recompute Z-component of perturbation if 'renorm' is enabled, this provides a higher
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// precision result
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