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Got through the requisite amount of invisible pain to get something onto my GL display. But clearly this is factored in entirely the wrong way. Work to do.

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This commit is contained in:
Thomas Harte 2015-07-24 20:37:08 -04:00
parent 31338ef754
commit 5ab47e600a
1 changed files with 73 additions and 1 deletions
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74
OSBindings/Mac/Clock Signal/Atari2600.mm
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@ -8,7 +8,31 @@
#import "Atari2600.h"
#import "Atari2600.hpp"
#import <OpenGL/gl.h>
#import <OpenGL/gl3.h>
const char *vertexShader =
"#version 150\n"
"\n"
"in vec2 position;\n"
"\n"
"out vec4 colour;\n"
"\n"
"void main (void)\n"
"{\n"
"colour = vec4(position, 0.0, 1.0);\n"
"gl_Position = vec4(position, 0.0, 1.0);\n"
"}\n";
const char *fragmentShader =
"#version 150\n"
"\n"
"in vec4 colour;\n"
"out vec4 fragColour;\n"
"\n"
"void main(void)\n"
"{\n"
"fragColour = colour;\n"
"}\n";
@interface CSAtari2600 (Callbacks)
- (void)crtDidEndFrame:(Outputs::CRTFrame *)frame;
@ -25,6 +49,11 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
dispatch_queue_t _serialDispatchQueue;
Outputs::CRTFrame *_queuedFrame;
GLuint _vertexShader, _fragmentShader;
GLuint _shaderProgram;
GLuint _arrayBuffer, _vertexArray;
}
- (void)crtDidEndFrame:(Outputs::CRTFrame *)frame {
@ -41,12 +70,55 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
});
}
- (GLuint)compileShader:(const char *)source type:(GLenum)type
{
GLuint shader = glCreateShader(type);
glShaderSource(shader, 1, &source, NULL);
glCompileShader(shader);
return shader;
}
- (void)draw {
if(!_shaderProgram)
{
_shaderProgram = glCreateProgram();
_vertexShader = [self compileShader:vertexShader type:GL_VERTEX_SHADER];
_fragmentShader = [self compileShader:fragmentShader type:GL_FRAGMENT_SHADER];
glAttachShader(_shaderProgram, _vertexShader);
glAttachShader(_shaderProgram, _fragmentShader);
glLinkProgram(_shaderProgram);
glGenVertexArrays(1, &_vertexArray);
glBindVertexArray(_vertexArray);
glGenBuffers(1, &_arrayBuffer);
glBindBuffer(GL_ARRAY_BUFFER, _arrayBuffer);
GLfloat vertices[] = {
0.0f, 0.0f,
0.5f, 0.0f,
0.5f, 0.6f,
0.0f, 0.5f
};
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
}
if(_queuedFrame)
{
glClearColor(1.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(_shaderProgram);
GLint position = glGetAttribLocation(_shaderProgram, "position");
glEnableVertexAttribArray(position);
glVertexAttribPointer(position, 2, GL_FLOAT, GL_FALSE, 0, (void *)0);
glDrawArrays(GL_LINES, 0, 4);
/* printf("\n\n===\n\n");
int c = 0;
for(int run = 0; run < _queuedFrame->number_of_runs; run++)