From 950b3c95590aea7420e7dd4c7ae21ba0a0805ea6 Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Sat, 5 Dec 2020 23:57:53 -0500
Subject: shader

---
 sim.h | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

(limited to 'sim.h')

diff --git a/sim.h b/sim.h
index cb05fb9..e52023a 100644
--- a/sim.h
+++ b/sim.h
@@ -18,6 +18,84 @@
 #define maybe_unused
 #endif
 
+typedef void (APIENTRY *GLAttachShader)(GLuint program, GLuint shader);
+typedef void (APIENTRY *GLCompileShader)(GLuint shader);
+typedef GLuint (APIENTRY *GLCreateProgram)(void);
+typedef GLuint (APIENTRY *GLCreateShader)(GLenum shaderType);
+typedef void (APIENTRY *GLDeleteProgram)(GLuint program);
+typedef void (APIENTRY *GLDeleteShader)(GLuint shader);
+typedef GLint (APIENTRY *GLGetAttribLocation)(GLuint program, const char *name);
+typedef void (APIENTRY *GLGetProgramInfoLog)(GLuint program, GLsizei maxLength, GLsizei *length, char *infoLog);
+typedef void (APIENTRY *GLGetProgramiv)(GLuint program, GLenum pname, GLint *params);
+typedef void (APIENTRY *GLGetShaderInfoLog)(GLuint shader, GLsizei maxLength, GLsizei *length, char *infoLog);
+typedef void (APIENTRY *GLGetShaderiv)(GLuint shader, GLenum pname, GLint *params);
+typedef GLint (APIENTRY *GLGetUniformLocation)(GLuint program, char const *name);
+typedef void (APIENTRY *GLLinkProgram)(GLuint program);
+typedef void (APIENTRY *GLShaderSource)(GLuint shader, GLsizei count, const char *const *string, const GLint *length);
+typedef void (APIENTRY *GLUniform1f)(GLint location, GLfloat v0);
+typedef void (APIENTRY *GLUniform2f)(GLint location, GLfloat v0, GLfloat v1);
+typedef void (APIENTRY *GLUniform3f)(GLint location, GLfloat v0, GLfloat v1, GLfloat v2);
+typedef void (APIENTRY *GLUniform4f)(GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);
+typedef void (APIENTRY *GLUniform1i)(GLint location, GLint v0);
+typedef void (APIENTRY *GLUniform2i)(GLint location, GLint v0, GLint v1);
+typedef void (APIENTRY *GLUniform3i)(GLint location, GLint v0, GLint v1, GLint v2);
+typedef void (APIENTRY *GLUniform4i)(GLint location, GLint v0, GLint v1, GLint v2, GLint v3);
+typedef void (APIENTRY *GLUniformMatrix4fv)(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
+typedef void (APIENTRY *GLUseProgram)(GLuint program);
+typedef void (APIENTRY *GLVertexAttrib1f)(GLuint index, GLfloat v0);
+typedef void (APIENTRY *GLVertexAttrib2f)(GLuint index, GLfloat v0, GLfloat v1);
+typedef void (APIENTRY *GLVertexAttrib3f)(GLuint index, GLfloat v0, GLfloat v1, GLfloat v2);
+typedef void (APIENTRY *GLVertexAttrib4f)(GLuint index, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);
+
+typedef struct {
+	GLAttachShader AttachShader;
+	GLCompileShader CompileShader;
+	GLCreateProgram CreateProgram;
+	GLCreateShader CreateShader;
+	GLDeleteProgram DeleteProgram;
+	GLDeleteShader DeleteShader;
+	GLGetAttribLocation GetAttribLocation;
+	GLGetProgramInfoLog GetProgramInfoLog;
+	GLGetProgramiv GetProgramiv;
+	GLGetShaderInfoLog GetShaderInfoLog;
+	GLGetShaderiv GetShaderiv;
+	GLGetUniformLocation GetUniformLocation;
+	GLLinkProgram LinkProgram;
+	GLShaderSource ShaderSource;
+	GLUniform1f Uniform1f;
+	GLUniform2f Uniform2f;
+	GLUniform3f Uniform3f;
+	GLUniform4f Uniform4f;
+	GLUniform1i Uniform1i;
+	GLUniform2i Uniform2i;
+	GLUniform3i Uniform3i;
+	GLUniform4i Uniform4i;
+	GLUniformMatrix4fv UniformMatrix4fv;
+	GLUseProgram UseProgram;
+	GLVertexAttrib1f VertexAttrib1f;
+	GLVertexAttrib2f VertexAttrib2f;
+	GLVertexAttrib3f VertexAttrib3f;
+	GLVertexAttrib4f VertexAttrib4f;
+} GL;
+
+typedef struct {
+	GLuint program;
+#if DEBUG
+	char vertex_filename[32];
+	char fragment_filename[32];
+	struct timespec last_modified;
+#endif
+} ShaderBase;
+
+typedef GLuint VertexAttributeLocation;
+typedef GLint UniformLocation;
+
+typedef struct {
+	ShaderBase base;
+	VertexAttributeLocation vertex_p1, vertex_p2;
+	UniformLocation uniform_thickness;
+} ShaderPlatform;
+
 typedef struct {
 	v2 center;
 	float size;
@@ -28,6 +106,9 @@ typedef struct {
 	bool initialized;
 	i32 win_width, win_height; // width,height of window
 
+	GL gl; // gl functions
+	ShaderPlatform shader_platform;
+
 	u32 nplatforms;
 	Platform platforms[1000];
 
-- 
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