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allow custom amount of framebuffers
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@FunkyFr3sh
FunkyFr3sh committed May 15, 2024
1 parent fdcf9a7 commit 10f4d8b
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Showing 2 changed files with 75 additions and 68 deletions.
5 changes: 3 additions & 2 deletions inc/render_ogl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
#include "opengl_utils.h"

#define TEXTURE_COUNT 4
#define FBO_COUNT 1

typedef struct OGLRENDERER
{
Expand All @@ -26,8 +27,8 @@ typedef struct OGLRENDERER
GLuint main_vbos[3];
GLuint main_vao;
GLint frame_count_uni_loc;
GLuint frame_buffer_id;
GLuint frame_buffer_tex_id;
GLuint frame_buffer_id[FBO_COUNT];
GLuint frame_buffer_tex_id[FBO_COUNT];
GLint scale_tex_coord_attr_loc;
GLuint scale_vbos[3];
GLuint scale_vao;
Expand Down
138 changes: 72 additions & 66 deletions src/render_ogl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -570,76 +570,82 @@ static void ogl_init_scale_program()
};
glUniformMatrix4fv(glGetUniformLocation(g_ogl.scale_program, "MVPMatrix"), 1, GL_FALSE, mvp_matrix);

glGenFramebuffers(1, &g_ogl.frame_buffer_id);
glBindFramebuffer(GL_FRAMEBUFFER, g_ogl.frame_buffer_id);

glGenTextures(1, &g_ogl.frame_buffer_tex_id);
glBindTexture(GL_TEXTURE_2D, g_ogl.frame_buffer_tex_id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, g_ogl.filter_bilinear ? GL_LINEAR : GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, g_ogl.filter_bilinear ? GL_LINEAR : GL_NEAREST);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RGBA8,
g_ogl.surface_tex_width,
g_ogl.surface_tex_height,
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
g_ogl.surface_tex);

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, g_ogl.frame_buffer_tex_id, 0);

GLenum draw_buffers[1] = { GL_COLOR_ATTACHMENT0 };
glDrawBuffers(1, draw_buffers);

if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
glGenFramebuffers(FBO_COUNT, g_ogl.frame_buffer_id);
glGenTextures(FBO_COUNT, g_ogl.frame_buffer_tex_id);

for (int i = 0; i < FBO_COUNT; i++)
{
glDeleteTextures(1, &g_ogl.frame_buffer_tex_id);
glBindFramebuffer(GL_FRAMEBUFFER, g_ogl.frame_buffer_id[i]);

if (glDeleteFramebuffers)
glDeleteFramebuffers(1, &g_ogl.frame_buffer_id);
glBindTexture(GL_TEXTURE_2D, g_ogl.frame_buffer_tex_id[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, g_ogl.filter_bilinear ? GL_LINEAR : GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, g_ogl.filter_bilinear ? GL_LINEAR : GL_NEAREST);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RGBA8,
g_ogl.surface_tex_width,
g_ogl.surface_tex_height,
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
g_ogl.surface_tex);

if (glDeleteProgram)
glDeleteProgram(g_ogl.scale_program);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, g_ogl.frame_buffer_tex_id[i], 0);

g_ogl.scale_program = 0;
GLenum draw_buffers[1] = { GL_COLOR_ATTACHMENT0 };
glDrawBuffers(1, draw_buffers);

if (glDeleteBuffers)
glDeleteBuffers(3, g_ogl.scale_vbos);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
glDeleteTextures(FBO_COUNT, g_ogl.frame_buffer_tex_id);

if (glDeleteVertexArrays)
glDeleteVertexArrays(1, &g_ogl.scale_vao);
if (glDeleteFramebuffers)
glDeleteFramebuffers(FBO_COUNT, g_ogl.frame_buffer_id);

if (g_ogl.main_program)
{
glBindVertexArray(g_ogl.main_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_ogl.main_vbos[0]);
static const GLfloat vertex_coord_pal[] = {
-1.0f, 1.0f,
1.0f, 1.0f,
1.0f,-1.0f,
-1.0f,-1.0f,
};
glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_coord_pal), vertex_coord_pal, GL_STATIC_DRAW);
glVertexAttribPointer(g_ogl.main_vertex_coord_attr_loc, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray(g_ogl.main_vertex_coord_attr_loc);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
if (glDeleteProgram)
glDeleteProgram(g_ogl.scale_program);

glBindVertexArray(g_ogl.main_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_ogl.main_vbos[1]);
GLfloat tex_coord_pal[] = {
0.0f, 0.0f,
g_ogl.scale_w, 0.0f,
g_ogl.scale_w, g_ogl.scale_h,
0.0f, g_ogl.scale_h,
};
glBufferData(GL_ARRAY_BUFFER, sizeof(tex_coord_pal), tex_coord_pal, GL_STATIC_DRAW);
glVertexAttribPointer(g_ogl.main_tex_coord_attr_loc, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray(g_ogl.main_tex_coord_attr_loc);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
g_ogl.scale_program = 0;

if (glDeleteBuffers)
glDeleteBuffers(3, g_ogl.scale_vbos);

if (glDeleteVertexArrays)
glDeleteVertexArrays(1, &g_ogl.scale_vao);

if (g_ogl.main_program)
{
glBindVertexArray(g_ogl.main_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_ogl.main_vbos[0]);
static const GLfloat vertex_coord_pal[] = {
-1.0f, 1.0f,
1.0f, 1.0f,
1.0f,-1.0f,
-1.0f,-1.0f,
};
glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_coord_pal), vertex_coord_pal, GL_STATIC_DRAW);
glVertexAttribPointer(g_ogl.main_vertex_coord_attr_loc, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray(g_ogl.main_vertex_coord_attr_loc);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);

glBindVertexArray(g_ogl.main_vao);
glBindBuffer(GL_ARRAY_BUFFER, g_ogl.main_vbos[1]);
GLfloat tex_coord_pal[] = {
0.0f, 0.0f,
g_ogl.scale_w, 0.0f,
g_ogl.scale_w, g_ogl.scale_h,
0.0f, g_ogl.scale_h,
};
glBufferData(GL_ARRAY_BUFFER, sizeof(tex_coord_pal), tex_coord_pal, GL_STATIC_DRAW);
glVertexAttribPointer(g_ogl.main_tex_coord_attr_loc, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray(g_ogl.main_tex_coord_attr_loc);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}

break;
}
}

Expand Down Expand Up @@ -866,7 +872,7 @@ static void ogl_render()

glViewport(0, 0, g_ddraw.width, g_ddraw.height);

glBindFramebuffer(GL_FRAMEBUFFER, g_ogl.frame_buffer_id);
glBindFramebuffer(GL_FRAMEBUFFER, g_ogl.frame_buffer_id[0]);

glBindVertexArray(g_ogl.main_vao);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
Expand Down Expand Up @@ -894,7 +900,7 @@ static void ogl_render()

glUseProgram(g_ogl.scale_program);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_ogl.frame_buffer_tex_id);
glBindTexture(GL_TEXTURE_2D, g_ogl.frame_buffer_tex_id[0]);

static int frames = 1;
if (g_ogl.frame_count_uni_loc != -1)
Expand Down Expand Up @@ -951,13 +957,13 @@ static void ogl_delete_context(HGLRC context)

if (g_ogl.scale_program)
{
glDeleteTextures(1, &g_ogl.frame_buffer_tex_id);
glDeleteTextures(FBO_COUNT, g_ogl.frame_buffer_tex_id);

if (glDeleteBuffers)
glDeleteBuffers(3, g_ogl.scale_vbos);

if (glDeleteFramebuffers)
glDeleteFramebuffers(1, &g_ogl.frame_buffer_id);
glDeleteFramebuffers(FBO_COUNT, g_ogl.frame_buffer_id);

if (glDeleteVertexArrays)
glDeleteVertexArrays(1, &g_ogl.scale_vao);
Expand Down

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