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renderer: Render to texture

shader-damage-experiments
Andri Yngvason 2020-03-26 18:49:37 +00:00
parent 7e709c23e9
commit b5f1ff0898
2 changed files with 51 additions and 3 deletions
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1
include/render.h
View File

@ -32,6 +32,7 @@ enum renderer_input_type {
struct renderer_fbo { struct renderer_fbo {
GLuint rbo; GLuint rbo;
GLuint fbo; GLuint fbo;
GLuint tex;
}; };
struct renderer { struct renderer {

53
src/render.c
View File

@ -451,18 +451,21 @@ void destroy_fbo(struct renderer_fbo* fbo)
{ {
glDeleteFramebuffers(1, &fbo->fbo); glDeleteFramebuffers(1, &fbo->fbo);
glDeleteRenderbuffers(1, &fbo->rbo); glDeleteRenderbuffers(1, &fbo->rbo);
if (fbo->tex)
glDeleteTextures(1, &fbo->tex);
} }
int create_fbo(struct renderer_fbo* dst, GLint format, uint32_t width, int create_fbo(struct renderer_fbo* dst, GLint format, uint32_t width,
uint32_t height) uint32_t height)
{ {
GLuint rbo; GLuint rbo = 0;
glGenRenderbuffers(1, &rbo); glGenRenderbuffers(1, &rbo);
glBindRenderbuffer(GL_RENDERBUFFER, rbo); glBindRenderbuffer(GL_RENDERBUFFER, rbo);
glRenderbufferStorage(GL_RENDERBUFFER, format, width, height); glRenderbufferStorage(GL_RENDERBUFFER, format, width, height);
glBindRenderbuffer(GL_RENDERBUFFER, 0); glBindRenderbuffer(GL_RENDERBUFFER, 0);
GLuint fbo; GLuint fbo = 0;
glGenFramebuffers(1, &fbo); glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo); glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
@ -477,6 +480,49 @@ int create_fbo(struct renderer_fbo* dst, GLint format, uint32_t width,
dst->fbo = fbo; dst->fbo = fbo;
dst->rbo = rbo; dst->rbo = rbo;
dst->tex = 0;
return 0;
}
int create_textured_fbo(struct renderer_fbo* dst, GLint format, uint32_t width,
uint32_t height)
{
GLuint rbo = 0;
glGenRenderbuffers(1, &rbo);
glBindRenderbuffer(GL_RENDERBUFFER, rbo);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES, width,
height);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
GLuint tex = 0;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format,
GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
GLuint fbo = 0;
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferRenderbuffer(GL_FRAMEBUFFER,
GL_LAYOUT_DEPTH_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER, rbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, tex, 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
if (status != GL_FRAMEBUFFER_COMPLETE) {
log_error("Framebuffer incomplete\n");
return -1;
}
dst->fbo = fbo;
dst->rbo = rbo;
dst->tex = tex;
return 0; return 0;
} }
@ -551,7 +597,8 @@ int renderer_init(struct renderer* self, const struct output* output,
uint32_t tf_width = output_get_transformed_width(output); uint32_t tf_width = output_get_transformed_width(output);
uint32_t tf_height = output_get_transformed_height(output); uint32_t tf_height = output_get_transformed_height(output);
if (create_fbo(&self->frame_fbo, GL_RGBA8_OES, tf_width, tf_height) < 0) if (create_textured_fbo(&self->frame_fbo, GL_RGBA, tf_width,
tf_height) < 0)
goto frame_fbo_failure; goto frame_fbo_failure;
if (create_fbo(&self->damage_fbo, GL_R8_EXT, tf_width, tf_height) < 0) if (create_fbo(&self->damage_fbo, GL_R8_EXT, tf_width, tf_height) < 0)