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Create and bind a dummy fragment shader for xfb on GLES

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* On GLES it's illegal to have just a vertex shader in a program, unless that
  program is separable
This commit is contained in:
baldurk
2019-04-03 16:42:41 +01:00
parent fe5c48ff35
commit cb47684766
1 changed files with 58 additions and 0 deletions
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renderdoc/driver/gl/gl_postvs.cpp
+58
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@@ -102,6 +102,8 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
return;
}
uint32_t glslVer = 0;
if(rs.Program.name == 0)
{
if(rs.Pipeline.name == 0)
@@ -121,6 +123,7 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
if(i == 0)
{
vsRefl = GetShader(pipeDetails.stageShaders[i], ShaderEntryPoint());
glslVer = m_pDriver->m_Shaders[pipeDetails.stageShaders[0]].version;
}
else if(i == 2)
{
@@ -180,6 +183,7 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
if(i == 0)
{
vsRefl = GetShader(progDetails.stageShaders[0], ShaderEntryPoint());
glslVer = m_pDriver->m_Shaders[progDetails.stageShaders[0]].version;
}
else if(i == 2 && progDetails.stageShaders[2] != ResourceId())
{
@@ -211,9 +215,55 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
return;
}
// GLES requires a fragment shader even with rasterizer discard, so we'll attach this
GLuint dummyFrag = 0;
if(IsGLES)
{
dummyFrag = drv.glCreateShader(eGL_FRAGMENT_SHADER);
if(glslVer == 0)
glslVer = 100;
std::string src =
StringFormat::Fmt("#version %d %s\nvoid main() {}\n", glslVer, glslVer == 100 ? "" : "es");
const char *csrc = src.c_str();
drv.glShaderSource(dummyFrag, 1, &csrc, NULL);
drv.glCompileShader(dummyFrag);
GLint status = 0;
drv.glGetShaderiv(dummyFrag, eGL_COMPILE_STATUS, &status);
if(status == 0)
{
drv.glDeleteShader(dummyFrag);
dummyFrag = 0;
if(HasExt[ARB_separate_shader_objects])
{
RDCERR(
"Couldn't create dummy fragment shader for GLES, trying to set program to be "
"separable");
drv.glProgramParameteri(feedbackProg, eGL_PROGRAM_SEPARABLE, GL_TRUE);
}
else
{
RDCERR(
"Couldn't create dummy fragment shader for GLES, separable programs not available. "
"Vertex output data will likely be broken");
}
}
}
// attach the vertex shader
drv.glAttachShader(feedbackProg, stageShaders[0]);
// attach the dummy fragment shader, if it exists
if(dummyFrag)
drv.glAttachShader(feedbackProg, dummyFrag);
list<string> matrixVaryings; // matrices need some fixup
vector<const char *> varyings;
@@ -394,6 +444,8 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
if(tmpShaders[i])
drv.glDeleteShader(tmpShaders[i]);
drv.glDeleteShader(dummyFrag);
drv.glDeleteProgram(feedbackProg);
return;
@@ -703,6 +755,8 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
if(tmpShaders[i])
drv.glDeleteShader(tmpShaders[i]);
drv.glDeleteShader(dummyFrag);
drv.glDeleteProgram(feedbackProg);
return;
@@ -1305,6 +1359,8 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
if(tmpShaders[i])
drv.glDeleteShader(tmpShaders[i]);
drv.glDeleteShader(dummyFrag);
return;
}
@@ -1444,6 +1500,8 @@ void GLReplay::InitPostVSBuffers(uint32_t eventId)
for(size_t i = 0; i < 4; i++)
if(tmpShaders[i])
drv.glDeleteShader(tmpShaders[i]);
drv.glDeleteShader(dummyFrag);
}
void GLReplay::InitPostVSBuffers(const vector<uint32_t> &passEvents)