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Add SpirvHelper (Shader cross compilation)

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- Make OpenGL2 and OpenGL3 use the same base shaders (using SpirvHelper)
- Add Transpose func to Mat4
This commit is contained in:
tobid7
2026-03-18 15:17:48 +01:00
parent 186fce803e
commit 7d89ab1c47
13 changed files with 424 additions and 139 deletions
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57
backends/source/gfx_opengl2.cpp
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@@ -6,47 +6,10 @@
#include <pd/drivers/drivers.hpp>
#include <pd_system/gl-helper.hpp>
#include <pd_system/shaders.hpp>
#include <pd_system/spirv-helper.hpp>
namespace PD {
const char* GfxOpenGL2::pVertCode = R"(
#version 120
attribute vec2 pos;
attribute vec2 uv;
attribute vec4 color;
varying vec2 oUV;
varying vec4 oColor;
// Probably forgot about this matrix and
// searched hours for why the rendering isn't working :/
uniform mat4 projection;
void main() {
gl_Position = projection*vec4(pos, 0.0, 1.0);
oUV = uv;
oColor = color;
}
)";
const char* GfxOpenGL2::pFragCode = R"(
#version 120
varying vec2 oUV;
varying vec4 oColor;
uniform sampler2D tex;
uniform bool alfa;
void main() {
vec4 tc = texture2D(tex, oUV);
if (alfa) {
gl_FragColor = vec4(oColor.rgb, tc.a * oColor.a);
} else {
gl_FragColor = tc * oColor;
}
}
)";
void GfxOpenGL2::pSetupShaderAttribs(u32 shader) {
GLint _pos = glGetAttribLocation(shader, "pos");
@@ -67,7 +30,17 @@ void GfxOpenGL2::pSetupShaderAttribs(u32 shader) {
}
void GfxOpenGL2::SysInit() {
pShader = CreateShaderProgram(pVertCode, pFragCode);
SpirvHelper::Init();
auto vshader =
SpirvHelper::GLSL2SPV(SpirvHelper::Stage::Vertex, Shaders::VertCode);
auto fshader =
SpirvHelper::GLSL2SPV(SpirvHelper::Stage::Fragment, Shaders::FragCode);
SpirvHelper::Finalize();
std::string vcode = SpirvHelper::SPV2GLSL(vshader, 110, false);
std::string fcode = SpirvHelper::SPV2GLSL(fshader, 110, false);
PDLOG("Vertex: \n{}", vcode);
PDLOG("Fragment: \n{}", fcode);
pShader = CreateShaderProgram(vcode.c_str(), fcode.c_str());
glUseProgram(pShader);
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
@@ -76,8 +49,8 @@ void GfxOpenGL2::SysInit() {
pSetupShaderAttribs(pShader);
pLocTex = glGetUniformLocation(pShader, "tex");
pLocAlfa = glGetUniformLocation(pShader, "alfa");
pLocProjection = glGetUniformLocation(pShader, "projection");
pLocAlfa = glGetUniformLocation(pShader, "push.alfa");
pLocProjection = glGetUniformLocation(pShader, "ubo.projection");
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);