kc3-lang/kc3/window/sdl2/gl_ortho.c

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  Commit

• Author : Thomas de Grivel
  Date : 2025-03-02 16:14:12
  Hash : db40523c
  Message : Change copyright wording and extend to 2025

• window/sdl2/gl_ortho.c

• /* kc3
   * Copyright from 2022 to 2025 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include <math.h>
  #include <libkc3/kc3.h>
  #include "gl_deprecated.h"
  #include "mat4.h"
  #include "gl_ortho.h"
  #include "gl_square.h"
  
  static const char * g_gl_ortho_vertex_shader_src =
    "#version 330 core\n"
    "layout (location = 0) in vec3 iPos;\n"
    "layout (location = 1) in vec3 iNormal;\n"
    "layout (location = 2) in vec2 iTexCoord;\n"
    "out vec3 ioFragNormal;\n"
    "out vec2 ioTexCoord;\n"
    "uniform mat4 uProjectionMatrix;\n"
    "uniform mat4 uViewMatrix;\n"
    "uniform mat4 uModelMatrix;\n"
    "void main() {\n"
    "  gl_Position = vec4(uProjectionMatrix * uViewMatrix * \n"
    "                     uModelMatrix * vec4(iPos, 1.0));\n"
    "  ioTexCoord = iTexCoord;\n"
    "  ioFragNormal = vec3(mat3(transpose(inverse(uModelMatrix))) *\n"
    "                      iNormal);\n"
    "}\n";
  
  static const char * g_gl_ortho_fragment_shader_src =
    "#version 330 core\n"
    "in vec3 ioFragNormal;\n"
    "in vec2 ioTexCoord;\n"
    "out vec4 oFragColor;\n"
    "uniform vec4 uColor;\n"
    "uniform bool uEnableTex2D;\n"
    "uniform sampler2D uTex2D;\n"
    "void main() {\n"
    "  vec4 texColor = texture(uTex2D, ioTexCoord);\n"
    "  if (uEnableTex2D) {\n"
    "    oFragColor = vec4(texColor[0] * uColor[0],\n"
    "                      texColor[1] * uColor[1],\n"
    "                      texColor[2] * uColor[2],\n"
    "                      texColor[3] * uColor[3]);\n"
    "  }\n"
    "  else\n"
    "    oFragColor = uColor;\n"
    "}\n";
  
  void gl_ortho_bind_texture (s_gl_ortho *ortho, GLuint texture)
  {
    assert(ortho);
    assert(glGetError() == GL_NO_ERROR);
    if (! texture) {
      glActiveTexture(GL_TEXTURE0);
      assert(glGetError() == GL_NO_ERROR);
      glBindTexture(GL_TEXTURE_2D, 0);
      assert(glGetError() == GL_NO_ERROR);
      glUniform1i(ortho->gl_enable_tex2d_loc, 0);
      assert(glGetError() == GL_NO_ERROR);
      glUniform1i(ortho->gl_tex2d_loc, 0);
      assert(glGetError() == GL_NO_ERROR);
      return;
    }
    glActiveTexture(GL_TEXTURE0);
    assert(glGetError() == GL_NO_ERROR);
    glBindTexture(GL_TEXTURE_2D, texture);
    assert(glGetError() == GL_NO_ERROR);
    glUniform1i(ortho->gl_enable_tex2d_loc, 1);
    assert(glGetError() == GL_NO_ERROR);
    glUniform1i(ortho->gl_tex2d_loc, 0);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_ortho_clean (s_gl_ortho *ortho)
  {
    assert(ortho);
    assert(glGetError() == GL_NO_ERROR);
    glDeleteProgram(ortho->gl_shader_program);
    assert(glGetError() == GL_NO_ERROR);
    gl_square_clean(&ortho->square);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_ortho_color (s_gl_ortho *ortho, f32 r, f32 g, f32 b, f32 a)
  {
    s_rgba color = {r, g, b, a};
    assert(ortho);
    assert(glGetError() == GL_NO_ERROR);
    glUniform4fv(ortho->gl_color_loc, 1, &color.r);    
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_ortho_delete (s_gl_ortho *ortho)
  {
    gl_ortho_clean(ortho);
    free(ortho);
  }
  
  s_gl_ortho * gl_ortho_init (s_gl_ortho *ortho)
  {
    GLuint fragment_shader;
    GLint success;
    GLuint vertex_shader;
    assert(ortho);
    if (! gl_square_init(&ortho->square, 2, 2))
      return NULL;
    mat4_init_identity(&ortho->projection_matrix);
    mat4_ortho(&ortho->projection_matrix, -1, 1, -1, 1, 0, 1);
    ortho->position.x = 0.0f;
    ortho->position.y = 0.0f;
    ortho->position.z = 0.0f;
    ortho->rotation.x = 0.0f;
    ortho->rotation.y = 0.0f;
    ortho->rotation.z = 0.0f;
    ortho->scale.x = 1.0f;
    ortho->scale.y = 1.0f;
    ortho->scale.z = 1.0f;
    mat4_init_identity(&ortho->view_matrix);
    mat4_init_identity(&ortho->model_matrix);
    vertex_shader = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertex_shader, 1, &g_gl_ortho_vertex_shader_src,
                   NULL);
    glCompileShader(vertex_shader);
    glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
    if (! success) {
      char info_log[512];
      glGetShaderInfoLog(vertex_shader, sizeof(info_log), NULL, info_log);
      err_write_1("gl_ortho_init: shader compilation failed: ");
      err_puts(info_log);
    }
    fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragment_shader, 1, &g_gl_ortho_fragment_shader_src,
                   NULL);
    glCompileShader(fragment_shader);
    glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
    if (! success) {
      char info_log[512];
      glGetShaderInfoLog(fragment_shader, sizeof(info_log), NULL, info_log);
      err_write_1("gl_ortho_init: shader compilation failed: ");
      err_puts(info_log);
    }
    ortho->gl_shader_program = glCreateProgram();
    assert(glGetError() == GL_NO_ERROR);
    glAttachShader(ortho->gl_shader_program, vertex_shader);
    assert(glGetError() == GL_NO_ERROR);
    glAttachShader(ortho->gl_shader_program, fragment_shader);
    assert(glGetError() == GL_NO_ERROR);
    glLinkProgram(ortho->gl_shader_program);
    assert(glGetError() == GL_NO_ERROR);
    glDeleteShader(vertex_shader);
    assert(glGetError() == GL_NO_ERROR);
    glDeleteShader(fragment_shader);
    assert(glGetError() == GL_NO_ERROR);
    ortho->gl_projection_matrix_loc =
      glGetUniformLocation(ortho->gl_shader_program, "uProjectionMatrix");
    assert(glGetError() == GL_NO_ERROR);
    ortho->gl_view_matrix_loc =
      glGetUniformLocation(ortho->gl_shader_program, "uViewMatrix");
    assert(glGetError() == GL_NO_ERROR);
    ortho->gl_model_matrix_loc =
      glGetUniformLocation(ortho->gl_shader_program, "uModelMatrix");
    assert(glGetError() == GL_NO_ERROR);
    ortho->gl_enable_tex2d_loc =
      glGetUniformLocation(ortho->gl_shader_program, "uEnableTex2D");
    assert(glGetError() == GL_NO_ERROR);
    ortho->gl_tex2d_loc =
      glGetUniformLocation(ortho->gl_shader_program, "uTex2D");
    assert(glGetError() == GL_NO_ERROR);
    ortho->gl_color_loc =
      glGetUniformLocation(ortho->gl_shader_program, "uColor");
    assert(glGetError() == GL_NO_ERROR);
    return ortho;
  }
  
  s_gl_ortho * gl_ortho_new (void)
  {
    s_gl_ortho *ortho;
    ortho = calloc(1, sizeof(s_gl_ortho));
    if (! ortho) {
      err_puts("gl_ortho_new: failed to allocate memory");
      return NULL;
    }
    if (! gl_ortho_init(ortho)) {
      free(ortho);
      return NULL;
    }
    return ortho;
  }
  
  void gl_ortho_rect (s_gl_ortho *ortho, f32 x, f32 y, f32 w, f32 h)
  {
    s_mat4 matrix;
    assert(ortho);
    assert(glGetError() == GL_NO_ERROR);
    matrix = ortho->model_matrix;
    mat4_translate(&ortho->model_matrix, x, y, 0.0f);
    mat4_scale(&ortho->model_matrix, w, h, 1.0f);
    gl_ortho_update_model_matrix(ortho);
    assert(glGetError() == GL_NO_ERROR);
    gl_square_render(&ortho->square);
    assert(glGetError() == GL_NO_ERROR);
    ortho->model_matrix = matrix;
    gl_ortho_update_model_matrix(ortho);
  }
  
  void gl_ortho_render (s_gl_ortho *ortho)
  {
    GLenum error;
    assert(ortho);
    assert(glGetError() == GL_NO_ERROR);
    glUseProgram(ortho->gl_shader_program);
    assert(glGetError() == GL_NO_ERROR);
    glUniformMatrix4fv(ortho->gl_projection_matrix_loc, 1, GL_FALSE,
                       &ortho->projection_matrix.xx);
    if ((error = glGetError()) != GL_NO_ERROR) {
      err_write_1("gl_ortho_render: glUniformMatrix4fv: ");
      err_puts(gl_error_string(error));
      assert(! "gl_ortho_render: glUniformMatrix4fv");
    }
    assert(glGetError() == GL_NO_ERROR);
    glUniformMatrix4fv(ortho->gl_view_matrix_loc, 1, GL_FALSE,
                       &ortho->view_matrix.xx);
    assert(glGetError() == GL_NO_ERROR);
    glUniformMatrix4fv(ortho->gl_model_matrix_loc, 1, GL_FALSE,
                       &ortho->model_matrix.xx);
    assert(glGetError() == GL_NO_ERROR);
    glUniform1i(ortho->gl_enable_tex2d_loc, 0);
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, 0);
    assert(glGetError() == GL_NO_ERROR);
    glUniform1i(ortho->gl_tex2d_loc, 0);
    assert(glGetError() == GL_NO_ERROR);
    glUniform4f(ortho->gl_color_loc, 1.0f, 1.0f, 1.0f, 1.0f);
    assert(glGetError() == GL_NO_ERROR);
    glDepthRange(ortho->clip_z_near, ortho->clip_z_far);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_ortho_render_end (s_gl_ortho *ortho)
  {
    assert(ortho);
    (void) ortho;
    assert(glGetError() == GL_NO_ERROR);
    glUseProgram(0);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_ortho_resize (s_gl_ortho *ortho, f32 x1, f32 x2, f32 y1, f32 y2,
                        f32 clip_z_near, f32 clip_z_far)
  {
    assert(ortho);
    mat4_init_identity(&ortho->projection_matrix);
    mat4_ortho(&ortho->projection_matrix, x1, x2, y1, y2,
               clip_z_near, clip_z_far);
  }
  
  void gl_ortho_text_render (s_gl_ortho *ortho, const s_gl_text *text)
  {
    assert(ortho);
    assert(text);
    gl_ortho_bind_texture(ortho, text->texture);
    gl_ortho_rect(ortho, 0, 0, text->pt_w, text->pt_h);
    gl_ortho_bind_texture(ortho, 0);
  }
  
  void gl_ortho_text_render_outline (s_gl_ortho *ortho, s_gl_text *text,
                                     f64 x, f64 y,
                                     const s_rgb *outline_color,
                                     const s_rgb *color)
  {
    s_mat4 matrix;
    assert(glGetError() == GL_NO_ERROR);
    glEnable(GL_BLEND);
    glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
                        GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
    assert(glGetError() == GL_NO_ERROR);
    gl_ortho_bind_texture(ortho, text->texture);
    assert(glGetError() == GL_NO_ERROR);
    gl_ortho_color(ortho, outline_color->r, outline_color->g,
                   outline_color->b, 1.0f);
    assert(glGetError() == GL_NO_ERROR);
    matrix = ortho->model_matrix;
    gl_ortho_rect(ortho, x - 1.0, y - 1.0, text->pt_w, text->pt_h);
    gl_ortho_rect(ortho, x,       y - 1.0, text->pt_w, text->pt_h);
    gl_ortho_rect(ortho, x + 1.0, y - 1.0, text->pt_w, text->pt_h);
    gl_ortho_rect(ortho, x - 1.0, y,       text->pt_w, text->pt_h);
    //gl_ortho_rect(ortho, x,       y,       text->pt_w, text->pt_h);
    gl_ortho_rect(ortho, x + 1.0, y,       text->pt_w, text->pt_h);
    gl_ortho_rect(ortho, x - 1.0, y + 1.0, text->pt_w, text->pt_h);
    gl_ortho_rect(ortho, x,       y + 1.0, text->pt_w, text->pt_h);
    gl_ortho_rect(ortho, x + 1.0, y + 1.0, text->pt_w, text->pt_h);
    gl_ortho_color(ortho, color->r, color->g, color->b, 1.0f);
    assert(glGetError() == GL_NO_ERROR);
    gl_ortho_rect(ortho, x,       y,       text->pt_w, text->pt_h);
    assert(glGetError() == GL_NO_ERROR);
    ortho->model_matrix = matrix;
    gl_ortho_update_model_matrix(ortho);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_ortho_update_model_matrix (s_gl_ortho *ortho)
  {
    assert(ortho);
    assert(glGetError() == GL_NO_ERROR);
    glUniformMatrix4fv(ortho->gl_model_matrix_loc, 1, GL_FALSE,
                       &ortho->model_matrix.xx);
    assert(glGetError() == GL_NO_ERROR);
    /*
    err_puts("gl_ortho_update_model_matrix projection matrix");
    mat4_buf_inspect(&g_c3_env.err, &ortho->projection_matrix);
    err_puts("view matrix");
    mat4_buf_inspect(&g_c3_env.err, &ortho->view_matrix);
    err_puts("model matrix");
    mat4_buf_inspect(&g_c3_env.err, &ortho->model_matrix);
    buf_flush(&g_c3_env.err);
    */
  }
  
  void gl_ortho_update_view_matrix (s_gl_ortho *ortho)
  {
    assert(ortho);
    assert(glGetError() == GL_NO_ERROR);
    mat4_init_identity(&ortho->view_matrix);
    mat4_translate(&ortho->view_matrix, ortho->position.x,
                   ortho->position.y, ortho->position.z);
    mat4_rotate_axis(&ortho->view_matrix, ortho->rotation.x,
                     &(s_vec3) { 1.0f, 0.0f, 0.0f });
    mat4_rotate_axis(&ortho->view_matrix, ortho->rotation.y,
                     &(s_vec3) { 0.0f, 1.0f, 0.0f });
    mat4_rotate_axis(&ortho->view_matrix, ortho->rotation.z,
                     &(s_vec3) { 0.0f, 0.0f, 1.0f });
    mat4_scale(&ortho->view_matrix, ortho->scale.x,
               ortho->scale.y, ortho->scale.z);
    glUniformMatrix4fv(ortho->gl_view_matrix_loc, 1, GL_FALSE,
                       &ortho->view_matrix.xx);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_ortho_vtext_render (s_gl_ortho *ortho, const s_gl_text *text)
  {
    assert(ortho);
    assert(text);
    gl_ortho_bind_texture(ortho, text->texture);
    gl_ortho_rect(ortho, 0, -text->pt_h, text->pt_w, text->pt_h);
    gl_ortho_bind_texture(ortho, 0);
  }