whole thing is compiling and running again

1 files changed, 130 insertions, 0 deletions

diff --git a/src/ral/backends/opengl/opengl_helpers.h b/src/ral/backends/opengl/opengl_helpers.h
new file mode 100644
index 0000000..f40bbca
--- /dev/null
+++ b/src/ral/backends/opengl/opengl_helpers.h
@@ -0,0 +1,130 @@
+#pragma once
+#include "defines.h"
+#include "ral_common.h"
+#include "ral_impl.h"
+#if defined(CEL_REND_BACKEND_OPENGL)
+#include "backend_opengl.h"
+#include "log.h"
+#include "file.h"
+#include "ral_types.h"
+
+#include <glad/glad.h>
+#include <glfw3.h>
+#include "ral_types.h"
+
+typedef struct opengl_vertex_attr {
+  u32 count;
+  GLenum data_type;
+} opengl_vertex_attr;
+
+static opengl_vertex_attr format_from_vertex_attr(VertexAttribType attr) {
+  switch (attr) {
+    case ATTR_F32:
+      return (opengl_vertex_attr){ .count = 1, .data_type = GL_FLOAT };
+    case ATTR_U32:
+      return (opengl_vertex_attr){ .count = 1, .data_type = GL_UNSIGNED_INT };
+    case ATTR_I32:
+      return (opengl_vertex_attr){ .count = 1, .data_type = GL_INT };
+    case ATTR_F32x2:
+      return (opengl_vertex_attr){ .count = 2, .data_type = GL_FLOAT };
+    case ATTR_U32x2:
+      // return VK_FORMAT_R32G32_UINT;
+    case ATTR_I32x2:
+      // return VK_FORMAT_R32G32_UINT;
+    case ATTR_F32x3:
+      return (opengl_vertex_attr){ .count = 3, .data_type = GL_FLOAT };
+    case ATTR_U32x3:
+      // return VK_FORMAT_R32G32B32_UINT;
+    case ATTR_I32x3:
+      // return VK_FORMAT_R32G32B32_SINT;
+    case ATTR_F32x4:
+      return (opengl_vertex_attr){ .count = 4, .data_type = GL_FLOAT };
+    case ATTR_U32x4:
+      // return VK_FORMAT_R32G32B32A32_UINT;
+    case ATTR_I32x4:
+      return (opengl_vertex_attr){ .count = 4, .data_type = GL_INT };
+  }
+}
+
+static u32 opengl_bindcreate_vao(GPU_Buffer* buf, VertexDescription desc) {
+  DEBUG("Vertex format name %s", desc.debug_label);
+  // 1. Bind the buffer
+  glBindBuffer(GL_ARRAY_BUFFER, buf->id.vbo);
+  // 2. Create new VAO
+  u32 vao;
+  glGenVertexArrays(1, &vao);
+  glBindVertexArray(vao);
+
+  // Attributes
+  u32 attr_count = desc.attributes_count;
+  printf("N attributes %d\n", attr_count);
+  u64 offset = 0;
+  size_t vertex_size = desc.use_full_vertex_size ? sizeof(Vertex) : desc.stride;
+  for (u32 i = 0; i < desc.attributes_count; i++) {
+    opengl_vertex_attr format = format_from_vertex_attr(desc.attributes[i]);
+    glVertexAttribPointer(i, format.count, format.data_type, GL_FALSE, vertex_size, (void*)offset);
+    TRACE(" %d %d %d %d %d %s", i, format.count, format.data_type, vertex_size, offset,
+          desc.attr_names[i]);
+    glEnableVertexAttribArray(i);  // nth index
+    size_t this_offset = VertexAttribSize(desc.attributes[i]);
+    printf("offset total %lld this attr %zu\n", offset, this_offset);
+    offset += this_offset;
+  }
+  glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+  return vao;
+}
+
+static u32 shader_create_separate(const char* vert_shader, const char* frag_shader) {
+  INFO("Load shaders at %s and %s", vert_shader, frag_shader);
+  int success;
+  char info_log[512];
+
+  u32 vertex = glCreateShader(GL_VERTEX_SHADER);
+  const char* vertex_shader_src = string_from_file(vert_shader);
+  if (vertex_shader_src == NULL) {
+    ERROR("EXIT: couldnt load shader");
+    exit(-1);
+  }
+  glShaderSource(vertex, 1, &vertex_shader_src, NULL);
+  glCompileShader(vertex);
+  glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
+  if (!success) {
+    glGetShaderInfoLog(vertex, 512, NULL, info_log);
+    printf("%s\n", info_log);
+    ERROR("EXIT: vertex shader compilation failed");
+    exit(-1);
+  }
+
+  // fragment shader
+  u32 fragment = glCreateShader(GL_FRAGMENT_SHADER);
+  const char* fragment_shader_src = string_from_file(frag_shader);
+  if (fragment_shader_src == NULL) {
+    ERROR("EXIT: couldnt load shader");
+    exit(-1);
+  }
+  glShaderSource(fragment, 1, &fragment_shader_src, NULL);
+  glCompileShader(fragment);
+  glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
+  if (!success) {
+    glGetShaderInfoLog(fragment, 512, NULL, info_log);
+    printf("%s\n", info_log);
+    ERROR("EXIT: fragment shader compilation failed");
+    exit(-1);
+  }
+
+  u32 shader_prog;
+  shader_prog = glCreateProgram();
+
+  glAttachShader(shader_prog, vertex);
+  glAttachShader(shader_prog, fragment);
+  glLinkProgram(shader_prog);
+  glDeleteShader(vertex);
+  glDeleteShader(fragment);
+  free((char*)vertex_shader_src);
+  free((char*)fragment_shader_src);
+
+  return shader_prog;
+}
+
+#endif