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Use the texture correctly in the two framebuffers

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This commit is contained in:
Dimitri Lozeve 2021-02-24 22:40:32 +01:00
parent f434b661eb
commit 528a2a2765
1 changed files with 12 additions and 9 deletions
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21
src/main.c
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@ -38,9 +38,12 @@ int main(int argc, char *argv[]) {
return EXIT_FAILURE; return EXIT_FAILURE;
} }
compile_shaders(&screen_shader, screen_shader_file); compile_shaders(&screen_shader, screen_shader_file);
glUseProgram(screen_shader);
glUniform1i(glGetUniformLocation(screen_shader, "u_texture"), 0);
unsigned int buffer_shader = 0; unsigned int buffer_shader = 0;
unsigned int framebuffer = 0; unsigned int framebuffer = 0;
unsigned int texture_color_buffer = 0;
if (buffer_shader_file) { if (buffer_shader_file) {
buffer_shader = glCreateProgram(); buffer_shader = glCreateProgram();
if (!buffer_shader) { if (!buffer_shader) {
@ -50,13 +53,14 @@ int main(int argc, char *argv[]) {
return EXIT_FAILURE; return EXIT_FAILURE;
} }
compile_shaders(&buffer_shader, buffer_shader_file); compile_shaders(&buffer_shader, buffer_shader_file);
glUseProgram(buffer_shader);
glUniform1i(glGetUniformLocation(buffer_shader, "u_texture"), 0);
/* Framebuffer */ /* Framebuffer */
framebuffer = 0; framebuffer = 0;
glGenFramebuffers(1, &framebuffer); glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer); glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
/* color attachment texture */ /* color attachment texture */
unsigned int texture_color_buffer = 0;
glGenTextures(1, &texture_color_buffer); glGenTextures(1, &texture_color_buffer);
glBindTexture(GL_TEXTURE_2D, texture_color_buffer); glBindTexture(GL_TEXTURE_2D, texture_color_buffer);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, WINDOW_WIDTH, WINDOW_HEIGHT, 0, glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, WINDOW_WIDTH, WINDOW_HEIGHT, 0,
@ -68,6 +72,9 @@ int main(int argc, char *argv[]) {
/* check that the framebuffer is complete */ /* check that the framebuffer is complete */
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
log_error("Framebuffer is not complete"); log_error("Framebuffer is not complete");
glfwDestroyWindow(window);
glfwTerminate();
return EXIT_FAILURE;
} else { } else {
log_debug("Framebuffer initialized and complete"); log_debug("Framebuffer initialized and complete");
} }
@ -100,8 +107,6 @@ int main(int argc, char *argv[]) {
glClearColor(0, 0, 0, 1.0f); glClearColor(0, 0, 0, 1.0f);
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(buffer_shader);
/* Setup uniforms */ /* Setup uniforms */
glUniform1ui(glGetUniformLocation(buffer_shader, "u_frame"), frame); glUniform1ui(glGetUniformLocation(buffer_shader, "u_frame"), frame);
glUniform1f(glGetUniformLocation(buffer_shader, "u_time"), time); glUniform1f(glGetUniformLocation(buffer_shader, "u_time"), time);
@ -109,11 +114,11 @@ int main(int argc, char *argv[]) {
viewport[2], viewport[3]); viewport[2], viewport[3]);
glUniform2f(glGetUniformLocation(buffer_shader, "u_mouse"), mouse_x, glUniform2f(glGetUniformLocation(buffer_shader, "u_mouse"), mouse_x,
mouse_y); mouse_y);
glUniform1d(glGetUniformLocation(buffer_shader, "u_texture"), 0);
/* Draw the vertices */ /* Draw the vertices */
// glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); /* For wireframe mode */
glBindVertexArray(VAO); glBindVertexArray(VAO);
glUseProgram(buffer_shader);
glBindTexture(GL_TEXTURE_2D, texture_color_buffer);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glBindVertexArray(0); glBindVertexArray(0);
@ -124,8 +129,6 @@ int main(int argc, char *argv[]) {
glClearColor(1.0, 1.0, 1.0, 1.0); glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(screen_shader);
/* Setup uniforms */ /* Setup uniforms */
glUniform1ui(glGetUniformLocation(screen_shader, "u_frame"), frame); glUniform1ui(glGetUniformLocation(screen_shader, "u_frame"), frame);
glUniform1f(glGetUniformLocation(screen_shader, "u_time"), time); glUniform1f(glGetUniformLocation(screen_shader, "u_time"), time);
@ -133,11 +136,11 @@ int main(int argc, char *argv[]) {
viewport[2], viewport[3]); viewport[2], viewport[3]);
glUniform2f(glGetUniformLocation(screen_shader, "u_mouse"), mouse_x, glUniform2f(glGetUniformLocation(screen_shader, "u_mouse"), mouse_x,
mouse_y); mouse_y);
glUniform1d(glGetUniformLocation(screen_shader, "u_texture"), 0);
/* Draw the vertices */ /* Draw the vertices */
// glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); /* For wireframe mode */
glBindVertexArray(VAO); glBindVertexArray(VAO);
glUseProgram(screen_shader);
glBindTexture(GL_TEXTURE_2D, texture_color_buffer);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glBindVertexArray(0); glBindVertexArray(0);