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shared opengl context

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klemek
2025-09-21 03:05:32 +02:00
parent 4c61838665
commit 6714decf17
7 changed files with 111 additions and 115 deletions
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src/shaders.c
+88 -60
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@@ -35,8 +35,7 @@ static bool compile_shader(GLuint shader_id, char *name, char *source_code) {
return status_params == GL_TRUE;
}
static void init_textures(ShaderProgram *program, Context context,
unsigned int downscaling) {
static void init_textures(ShaderProgram *program, Context context) {
unsigned int i;
program->textures = malloc(program->tex_count * sizeof(GLuint));
@@ -47,23 +46,30 @@ static void init_textures(ShaderProgram *program, Context context,
// selects which texture unit subsequent texture state calls will affect
glActiveTexture(GL_TEXTURE0 + i);
glBindTexture(GL_TEXTURE_2D, program->textures[i]);
glEnable(GL_TEXTURE_2D);
glDisable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
glBindTexture(GL_TEXTURE_2D, program->textures[i]);
// define texture image as empty
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
(int)((context.internal_size / downscaling) *
(float)context.width / (context.height)),
context.internal_size / downscaling, 0, GL_RGB,
GL_UNSIGNED_BYTE, 0);
glTexImage2D(
GL_TEXTURE_2D, 0, GL_RGB,
(int)(context.internal_size * (float)context.width / (context.height)),
context.internal_size, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
// setup mipmap context
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}
}
log_success("Texture %d initialized", i);
static void rebind_textures(ShaderProgram *program) {
unsigned int i;
for (i = 0; i < program->tex_count; i++) {
glActiveTexture(GL_TEXTURE0 + i);
glBindTexture(GL_TEXTURE_2D, program->textures[i]);
}
}
@@ -105,15 +111,33 @@ static void init_framebuffers(ShaderProgram *program,
return;
}
static void init_vertices(ShaderProgram *program) {
static void init_vertices(ShaderProgram *program, bool rebind) {
unsigned int i;
// create vertex buffer and setup vertices
glGenBuffers(1, &program->vertex_buffer);
if (!rebind) {
glGenBuffers(1, &program->vertex_buffer);
}
glBindBuffer(GL_ARRAY_BUFFER, program->vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// create vertex array
glGenVertexArrays(1, &program->vertex_array);
glBindVertexArray(program->vertex_array);
if (!rebind) {
glGenVertexArrays(1, &program->vertex_array[0]);
glBindVertexArray(program->vertex_array[0]);
} else {
glGenVertexArrays(1, &program->vertex_array[1]);
glBindVertexArray(program->vertex_array[1]);
}
for (i = 0; i < program->frag_count; i++) {
// enable attribute pointer
glEnableVertexAttribArray(program->vpos_locations[i]);
// specify the location and data format of the array of generic vertex
// attributes to use when rendering
glVertexAttribPointer(program->vpos_locations[i], 2, GL_FLOAT, GL_FALSE,
sizeof(Vertex), (void *)offsetof(Vertex, pos));
}
}
static void init_shaders(ShaderProgram *program, File *fragment_shaders) {
@@ -147,7 +171,6 @@ static void init_single_program(ShaderProgram *program, unsigned int i,
char *sub_prefix;
char *seed_prefix;
char *state_prefix;
program->programs[i] = glCreateProgram();
glAttachShader(program->programs[i], program->vertex_shader);
@@ -214,12 +237,6 @@ static void init_single_program(ShaderProgram *program, unsigned int i,
// create attribute pointer
program->vpos_locations[i] =
glGetAttribLocation(program->programs[i], "vPos");
// enable attribute pointer
glEnableVertexAttribArray(program->vpos_locations[i]);
// specify the location and data format of the array of generic vertex
// attributes to use when rendering
glVertexAttribPointer(program->vpos_locations[i], 2, GL_FLOAT, GL_FALSE,
sizeof(Vertex), (void *)offsetof(Vertex, pos));
log_success("Program %d initialized", i + 1);
}
@@ -250,36 +267,41 @@ static void init_programs(ShaderProgram *program, ConfigFile shader_config) {
}
ShaderProgram shaders_init(File *fragment_shaders, ConfigFile shader_config,
Context context, unsigned int downscaling) {
Context context, ShaderProgram *previous) {
ShaderProgram program;
program.error = false;
program.last_width = context.width;
program.last_height = context.height;
program.tex_count = config_file_get_int(shader_config, "TEX_COUNT", 9);
program.frag_count = config_file_get_int(shader_config, "FRAG_COUNT", 6);
program.frag_output_index =
config_file_get_int(shader_config, "FRAG_OUTPUT", 1) - 1;
program.frag_monitor_index =
config_file_get_int(shader_config, "FRAG_MONITOR", 1) - 1;
program.sub_type_count =
config_file_get_int(shader_config, "SUB_TYPE_COUNT", 0);
program.sub_variant_count =
config_file_get_int(shader_config, "SUB_VARIANT_COUNT", 1);
if (previous == NULL) {
program.error = false;
program.last_width = context.width;
program.last_height = context.height;
program.tex_count = config_file_get_int(shader_config, "TEX_COUNT", 9);
program.frag_count = config_file_get_int(shader_config, "FRAG_COUNT", 6);
program.frag_output_index =
config_file_get_int(shader_config, "FRAG_OUTPUT", 1) - 1;
program.frag_monitor_index =
config_file_get_int(shader_config, "FRAG_MONITOR", 1) - 1;
program.sub_type_count =
config_file_get_int(shader_config, "SUB_TYPE_COUNT", 0);
program.sub_variant_count =
config_file_get_int(shader_config, "SUB_VARIANT_COUNT", 1);
init_textures(&program, context, downscaling);
init_shaders(&program, fragment_shaders);
init_framebuffers(&program, shader_config);
if (program.error) {
return program;
}
init_shaders(&program, fragment_shaders);
init_textures(&program, context);
if (program.error) {
return program;
init_framebuffers(&program, shader_config);
init_programs(&program, shader_config);
} else {
program = *previous;
}
init_vertices(&program);
init_programs(&program, shader_config);
init_vertices(&program, previous != NULL);
return program;
}
@@ -298,8 +320,7 @@ void shaders_update(ShaderProgram program, File *fragment_shaders,
}
}
static void update_viewport(ShaderProgram program, Context context,
unsigned int downscaling) {
static void update_viewport(ShaderProgram program, Context context) {
unsigned int i;
// viewport changed
@@ -309,16 +330,15 @@ static void update_viewport(ShaderProgram program, Context context,
for (i = 0; i < program.tex_count; i++) {
glActiveTexture(GL_TEXTURE0 + i);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
(int)((context.internal_size / downscaling) *
(float)context.width / (context.height)),
(int)(float)context.internal_size / downscaling, 0, GL_RGB,
GL_UNSIGNED_BYTE, 0);
(int)(context.internal_size * (float)context.width /
(context.height)),
context.internal_size, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
}
}
}
static void use_program(ShaderProgram program, int i, bool output,
Context context, unsigned int downscaling) {
Context context) {
unsigned int j, k;
GLuint *subroutines;
vec2 resolution;
@@ -339,10 +359,10 @@ static void use_program(ShaderProgram program, int i, bool output,
// clear buffer
glClear(GL_COLOR_BUFFER_BIT);
} else {
glViewport(0, 0,
(int)((context.internal_size / downscaling) *
(float)context.width / (context.height)),
(int)(float)context.internal_size / downscaling);
glViewport(
0, 0,
(int)(context.internal_size * (float)context.width / (context.height)),
context.internal_size);
// use memory framebuffer
glBindFramebuffer(GL_FRAMEBUFFER, program.frame_buffers[i]);
@@ -389,18 +409,26 @@ static void use_program(ShaderProgram program, int i, bool output,
}
void shaders_compute(ShaderProgram program, Context context, bool monitor,
unsigned int downscaling) {
bool output_only) {
unsigned int i;
update_viewport(program, context, downscaling);
if (!output_only) {
glBindVertexArray(program.vertex_array[0]);
for (i = 0; i < program.frag_count; i++) {
if (i != program.frag_output_index && i != program.frag_monitor_index) {
use_program(program, i, false, context, downscaling);
update_viewport(program, context);
for (i = 0; i < program.frag_count; i++) {
if (i != program.frag_output_index && i != program.frag_monitor_index) {
use_program(program, i, false, context);
}
}
} else {
glBindVertexArray(program.vertex_array[1]);
rebind_textures(&program);
}
use_program(program,
monitor ? program.frag_monitor_index : program.frag_output_index,
true, context, downscaling);
true, context);
}