create framebuffer object

projects/apis/opengl/loader/opengl_device_loader.c

@@ -11,6 +11,7 @@
 #include "framebuffer/opengl_framebuffer.h"
 #include "graphics_pipeline/opengl_graphics_pipeline.h"
 #include "submit/opengl_submit.h"
+#include "present/opengl_present.h"
 
 gnDeviceFunctions loadOpenGLDeviceFunctions() {
     return (gnDeviceFunctions){
@@ -53,7 +54,7 @@ gnDeviceFunctions loadOpenGLDeviceFunctions() {
         ._gnDestroyTexture = openglDestroyTexture,
 
         ._gnSubmit = openglSubmit,
-        ._gnPresent = NULL,
+        ._gnPresent = openglPresent,
 
         ._gnWaitForDevice = waitForOpenGLDevice
     };

projects/apis/opengl/src/device/glsl_shader.glsl

@@ -0,0 +1,22 @@
+const char * vertex_shader_source =
+    "#version 450 core"
+    ""
+    "layout(location = 0) in vec2 inPosition;"
+    "layout(location = 1) in vec2 inTexcoord;"
+    ""
+    "out vec2 texcoord;"
+    ""
+    "void main() {"
+    "    gl_Position = vec4(inPosition, 0.0, 1.0);"
+    "    texcoord = inTexcoord;"
+    "}" ;
+const char * fragment_shader_source =
+    "#version 450 core"
+    ""
+    "out vec4 FragColor;"
+    "layout(binding = 0) uniform sampler2D tex;"
+    "in vec2 texcoord;"
+    ""
+    "void main() {"
+    "    FragColor = texture(tex, texcoord);"
+    "}" ;

projects/apis/opengl/src/device/opengl_output_device.c

@@ -1,5 +1,43 @@
+#include "glad/glad.h"
 #include "opengl_output_device.h"
+#include "glsl_shader.glsl"
+#include "stdlib.h"
 
-gnReturnCode createOpenGLOutputDevice(gnInstanceHandle instance, gnOutputDeviceHandle device, gnOutputDeviceInfo deviceInfo) { return GN_SUCCESS; }
+gnReturnCode createOpenGLOutputDevice(gnInstanceHandle instance, gnOutputDeviceHandle device, gnOutputDeviceInfo deviceInfo) {
+    device->outputDevice = malloc(sizeof(gnPlatformOutputDevice));
+    float vertices[] = {
+        -1.0f, -1.0f, 0.0f, 1.0f,
+         1.0f, -1.0f, 1.0f, 1.0f,
+        -1.0f,  1.0f, 0.0f, 0.0f,
+         1.0f,  1.0f, 1.0f, 0.0f,
+    };
+    glCreateBuffers(1, &device->outputDevice->buffer);
+    glBindBuffer(GL_ARRAY_BUFFER, device->outputDevice->buffer);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 2, (void*)0);
+    glEnableVertexAttribArray(0);
+
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 2, (void*)(sizeof(float) * 2));
+    glEnableVertexAttribArray(1);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    unsigned int vertexShader;
+    vertexShader = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vertexShader, 1, &vertex_shader_source, NULL);
+    glCompileShader(vertexShader);
+
+    unsigned int fragmentShader;
+    fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fragmentShader, 1, &fragment_shader_source, NULL);
+    glCompileShader(fragmentShader);
+
+    device->outputDevice->shaderProgram = glCreateProgram();
+    glAttachShader(device->outputDevice->shaderProgram, vertexShader);
+    glAttachShader(device->outputDevice->shaderProgram, fragmentShader);
+    glLinkProgram(device->outputDevice->shaderProgram);
+
+    return GN_SUCCESS;
+}
 void waitForOpenGLDevice(const gnOutputDeviceHandle device) {}
 void destroyOpenGLOutputDevice(gnOutputDeviceHandle device) {}

projects/apis/opengl/src/device/opengl_output_device.h

@@ -1,7 +1,9 @@
 #pragma once
 #include <output_device/gryphn_output_device.h>
 
-typedef struct gnPlatformOutputDevice_t {} gnPlatformOutputDevice;
+typedef struct gnPlatformOutputDevice_t {
+    unsigned int buffer, shaderProgram;
+} gnPlatformOutputDevice;
 
 gnReturnCode createOpenGLOutputDevice(gnInstanceHandle instance, gnOutputDeviceHandle device, gnOutputDeviceInfo deviceInfo);
 void waitForOpenGLDevice(const gnOutputDeviceHandle device);