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Got rigorous on exceptions, started working towards having a working 'composite' shader at the same time as having a working RGB shader.

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This commit is contained in:
Thomas Harte 2016-04-19 08:05:43 -04:00
parent bcc784bda9
commit 6c9bcfa637
4 changed files with 43 additions and 36 deletions
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63
Outputs/CRT/Internals/CRTOpenGL.cpp
View File

@ -232,7 +232,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
// transfer to screen
glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
compositeTexture->bind_texture();
perform_output_stage(output_width, output_height, rgb_shader_program.get());
perform_output_stage(output_width, output_height, composite_output_shader_program.get());
}
else
perform_output_stage(output_width, output_height, rgb_shader_program.get());
@ -463,32 +463,17 @@ char *OpenGLOutputBuilder::get_output_vertex_shader()
char *OpenGLOutputBuilder::get_rgb_output_fragment_shader()
{
return get_output_fragment_shader(_rgb_shader);
return get_output_fragment_shader(_rgb_shader, "uniform usampler2D texID;", "rgb_sample(texID, srcCoordinatesVarying, iSrcCoordinatesVarying)");
}
char *OpenGLOutputBuilder::get_composite_output_fragment_shader()
{
return strdup(
"#version 150\n"
"in float lateralVarying;"
"in float alpha;"
"in vec2 srcCoordinatesVarying;"
"out vec4 fragColour;"
"uniform sampler2D texID;"
"void main(void)"
"{"
"fragColour = vec4(texture(texID, srcCoordinatesVarying).rgb, clamp(alpha, 0.0, 1.0)*sin(lateralVarying));" //
"}"
);
return get_output_fragment_shader("", "uniform sampler2D texID;", "texture(texID, srcCoordinatesVarying).rgb");
}
char *OpenGLOutputBuilder::get_output_fragment_shader(const char *sampling_function)
char *OpenGLOutputBuilder::get_output_fragment_shader(const char *sampling_function, const char *header, const char *fragColour_function)
{
return get_compound_shader(
char *complete_header = get_compound_shader(
"#version 150\n"
"in float lateralVarying;"
@ -499,20 +484,25 @@ char *OpenGLOutputBuilder::get_output_fragment_shader(const char *sampling_funct
"out vec4 fragColour;"
// "uniform usampler2D texID;"
"uniform sampler2D texID;"
// "uniform sampler2D shadowMaskTexID;"
"\n%s\n"
// "uniform sampler2D shadowMaskTexID;",
"%s\n%%s\n",
header);
char *complete_body = get_compound_shader(
"%%s\n"
"void main(void)"
"{"
// "fragColour = vec4(srcCoordinatesVarying.rg, 0.0, 1.0);" //
"fragColour = vec4(texture(texID, srcCoordinatesVarying).rgb, clamp(alpha, 0.0, 1.0)*sin(lateralVarying));" //
// "fragColour = vec4(srcCoordinatesVarying.y / 4.0, 0.0, 0.0, 1.0);"//texture(texID, srcCoordinatesVarying).rgba;" //
// "fragColour = vec4(rgb_sample(texID, srcCoordinatesVarying, iSrcCoordinatesVarying), clamp(alpha, 0.0, 1.0)*sin(lateralVarying));" //
"}"
, sampling_function);
"fragColour = vec4(%s, clamp(alpha, 0.0, 1.0)*sin(lateralVarying));"
"}",
fragColour_function);
char *top = get_compound_shader(complete_header, sampling_function);
free(complete_header);
char *result = get_compound_shader(complete_body, top);
free(complete_body);
return result;
}
#pragma mark - Shader utilities
@ -621,7 +611,15 @@ std::unique_ptr<OpenGL::Shader> OpenGLOutputBuilder::prepare_output_shader(char
if(vertex_shader && fragment_shader)
{
shader_program = std::unique_ptr<OpenGL::Shader>(new OpenGL::Shader(vertex_shader, fragment_shader, nullptr));
OpenGL::Shader::AttributeBinding bindings[] =
{
{"position", 0},
{"srcCoordinates", 1},
{"lateralAndTimestampBaseOffset", 2},
{"timestamp", 3},
{nullptr}
};
shader_program = std::unique_ptr<OpenGL::Shader>(new OpenGL::Shader(vertex_shader, fragment_shader, bindings));
shader_program->bind();
windowSizeUniform = shader_program->get_uniform_location("windowSize");
@ -659,7 +657,6 @@ void OpenGLOutputBuilder::prepare_rgb_output_shader()
void OpenGLOutputBuilder::prepare_composite_output_shader()
{
// rgb_shader_program = prepare_output_shader(get_composite_output_fragment_shader());
composite_output_shader_program = prepare_output_shader(get_composite_output_fragment_shader());
}

2
Outputs/CRT/Internals/CRTOpenGL.hpp
View File

@ -65,7 +65,7 @@ class OpenGLOutputBuilder {
char *get_output_vertex_shader();
char *get_output_fragment_shader(const char *sampling_function);
char *get_output_fragment_shader(const char *sampling_function, const char *header, const char *fragColour_function);
char *get_rgb_output_fragment_shader();
char *get_composite_output_fragment_shader();

3
Outputs/CRT/Internals/Shader.cpp
View File

@ -32,6 +32,8 @@ GLuint Shader::compile_shader(const char *source, GLenum type)
printf("Compile log:\n%s\n", log);
free(log);
}
throw (type == GL_VERTEX_SHADER) ? VertexShaderCompilationError : FragmentShaderCompilationError;
}
#endif
@ -71,6 +73,7 @@ Shader::Shader(const char *vertex_shader, const char *fragment_shader, const Att
printf("Link log:\n%s\n", log);
free(log);
}
throw ProgramLinkageError;
}
#endif
}

9
Outputs/CRT/Internals/Shader.hpp
View File

@ -14,13 +14,19 @@
namespace OpenGL {
class Shader {
public:
enum {
VertexShaderCompilationError,
FragmentShaderCompilationError,
ProgramLinkageError
};
struct AttributeBinding {
const GLchar *name;
GLuint index;
};
/*!
Constructs a shader, comprised of:
Attempts to compile a shader, throwing @c VertexShaderCompilationError, @c FragmentShaderCompilationError or @c ProgramLinkageError upon failure.
@param vertex_shader The vertex shader source code.
@param fragment_shader The fragment shader source code.
@param attribute_bindings Either @c nullptr or an array terminated by an entry with a @c nullptr-name of attribute bindings.
@ -47,6 +53,7 @@ namespace OpenGL {
*/
GLint get_uniform_location(const GLchar *name);
private:
GLuint compile_shader(const char *source, GLenum type);
GLuint _shader_program;